{"id":4146,"date":"2016-05-06T11:49:00","date_gmt":"2016-05-06T11:49:00","guid":{"rendered":"http:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/"},"modified":"2018-06-07T15:38:45","modified_gmt":"2018-06-07T10:08:45","slug":"ncert-solutions-class-9-science-sound-part-1","status":"publish","type":"post","link":"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/","title":{"rendered":"NCERT Solutions for Class 9 Science Sound part 1"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_76 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#NCERT_Class_9_Science_Chapter_wise_Solutions\" >NCERT Class 9 Science Chapter wise Solutions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#NCERT_Solutions_for_Class_9_Science_Sound_part_1\" >NCERT Solutions for Class 9 Science Sound part 1<\/a><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><ul class='ez-toc-list-level-6' ><li class='ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_How_does_the_sound_produced_by_a_vibrating_object_in_a_medium_reach_your_ear\" >1. How does the sound produced by a vibrating object in a medium reach your ear.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_Explain_how_sound_is_produced_by_your_school_bell\" >1. Explain how sound is produced by your school bell.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#2_Why_are_sound_waves_called_mechanical_waves\" >2. Why are sound waves called mechanical waves?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#3_Suppose_you_and_your_friend_are_on_the_moon_Will_you_be_able_to_hear_any_sound_produced_by_your_friend\" >3. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_Which_wave_property_determines\" >1. Which wave property determines<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#2_Guess_which_sound_has_a_higher_pitch_guitar_or_car_horn\" >2. Guess which sound has a higher pitch: guitar or car horn?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_What_are_wavelength_frequency_time_period_and_amplitude_of_a_sound_wave\" >1. What are wavelength, frequency, time period and amplitude of a sound wave?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#2_How_are_the_wavelength_and_frequency_of_a_sound_wave_related_to_its_speed\" >2. How are the wavelength and frequency of a sound wave related to its speed?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#3_Calculate_the_wavelength_of_a_sound_wave_whose_frequency_is_220_Hz_and_speed_is_440_ms_in_a_given_medium\" >3. Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m\/s in a given medium.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#4_A_person_is_listening_to_a_tone_of_500_Hz_sitting_at_a_distance_of_450_m_from_the_source_of_the_sound_What_is_the_time_interval_between_successive_compressions_from_the_source\" >4. A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_Distinguish_between_loudness_and_intensity_of_sound\" >1. Distinguish between loudness and intensity of sound.<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_In_which_of_the_three_media_air_water_or_iron_does_sound_travel_the_fastest_at_a_particular_temperature\" >1. In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_An_echo_returned_in_3_s_What_is_the_distance_of_the_reflecting_surface_from_the_source_given_that_the_speed_of_sound_is\" >1. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_Why_are_the_ceilings_of_concert_halls_curved\" >1. Why are the ceilings of concert halls curved?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_What_is_the_audible_range_of_the_average_human_ear\" >1. What is the audible range of the average human ear?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#2_What_is_the_range_of_frequencies_associated_with\" >2. What is the range of frequencies associated with<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-6'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#1_A_submarine_emits_a_sonar_pulse_which_returns_from_an_underwater_cliff_in_102_s_If_the_speed_of_sound_in_salt_water_is_1531_ms_how_far_away_is_the_cliff\" >1. A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m\/s, how far away is the cliff?<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#NCERT_Solutions_for_Class_9_Science\" >NCERT Solutions for Class 9 Science<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/#CBSE_app_for_Class_9\" >CBSE app for Class 9<\/a><\/li><\/ul><\/nav><\/div>\n<p>NCERT Solutions for Class 9 Science Sound part 1 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.<\/p>\n<p style=\"text-align: center;\"><strong>NCERT solutions for Science Sound\u00a0<a class=\"button\" href=\"https:\/\/mycbseguide.com\/downloads\/cbse-class-09-science\/1218\/ncert-solutions\/5\/\">Download as PDF<\/a><\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/media-mycbseguide.s3.ap-south-1.amazonaws.com\/images\/blog\/09_Science_Book.jpg\" alt=\"NCERT Solutions for Class 9 Science Sound part 1\" width=\"179\" height=\"241\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Class_9_Science_Chapter_wise_Solutions\"><\/span><span class=\"underline-text\">NCERT Class 9 Science Chapter wise Solutions<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>01 \u2013 \u00a0Matter in Our Surroundings<\/li>\n<li>02 \u2013 Is Mattter Around us Pure<\/li>\n<li>03 \u2013 Atoms and Molecules<\/li>\n<li>04 \u2013 Structure of the Atom<\/li>\n<li>05 \u2013 The Fundamental Unit of Life<\/li>\n<li>06 \u2013 Tissues<\/li>\n<li>07 \u2013 Diversity in Living Organisms<\/li>\n<li>08 \u2013 Motion<\/li>\n<li>09 \u2013 Force and Laws of Motion<\/li>\n<li>10 \u2013 Gravitation<\/li>\n<li>11 \u2013 Word and Energy<\/li>\n<li>12 \u2013 Sound<\/li>\n<li>13 \u2013 Why Do We Fall Ill<\/li>\n<li>14 \u2013 Natural Resources<\/li>\n<li>15 \u2013 Improvement in Food Resources<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science_Sound_part_1\"><\/span>NCERT Solutions for Class 9 Science Sound part 1<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_How_does_the_sound_produced_by_a_vibrating_object_in_a_medium_reach_your_ear\"><\/span><strong>1. How does the sound produced by a vibrating object in a medium reach your ear.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>As we speak, the particles of air near our mouth are pushed forward so they get compressed. Then they compress the other particles of air. As the compression proceeds the particles of air near our mouth expand again and thus rarefaction occurs. This process is repeated further and as a result sound wave propagates in the form of compressions and rarefactions to the listener\u2019s ear.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_Explain_how_sound_is_produced_by_your_school_bell\"><\/span><strong>1. Explain how sound is produced by your school bell.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>When the peon strikes the school bell with a hammer, the particles of bell metal start vibrating and those vibrations produce sound.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_Why_are_sound_waves_called_mechanical_waves\"><\/span><strong>2. Why are sound waves called mechanical waves?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Since sound waves need a medium for their propagation therefore we can say that sound waves are mechanical waves.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_Suppose_you_and_your_friend_are_on_the_moon_Will_you_be_able_to_hear_any_sound_produced_by_your_friend\"><\/span><strong>3. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>There is no air on moon hence there is no medium for sound propagation on moon. As a result, me and my friend will not be able to hear any sound produced by my friend.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_Which_wave_property_determines\"><\/span><strong>1. Which wave property determines <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) loudness, <\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) pitch?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. (a)<\/strong> The amplitude of the wave determines loudness of sound.<\/p>\n<p style=\"text-align: justify;\"><strong>(b)<\/strong> The frequency of the wave determines pitch of sound.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_Guess_which_sound_has_a_higher_pitch_guitar_or_car_horn\"><\/span><strong>2. Guess which sound has a higher pitch: guitar or car horn? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Sound of Guitar has a higher pitch.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_What_are_wavelength_frequency_time_period_and_amplitude_of_a_sound_wave\"><\/span><strong>1. What are wavelength, frequency, time period and amplitude of a sound wave?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. wavelength<\/strong>: For a sound wave, the combined length of a compression and an adjacent rarefaction is called its wavelength even the distance between centres of two consecutive compressions or two consecutive rarefactions is also equal to its wavelength.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 76px; width: 222px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image001.jpg\" alt=\"Image\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>frequency<\/strong>: The number of vibrations or oscillations per second is called frequency i.e. it is the number of complete waves or cycles produced in one second.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 1\" style=\"height: 125px; width: 228px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image002.jpg\" alt=\"Image\" \/><\/p>\n<p style=\"text-align: justify;\"><strong>time period<\/strong>: The time taken to complete one vibration\/oscillation\/complete wave is called time period. It is measured in seconds.<\/p>\n<p style=\"text-align: justify;\"><strong>amplitude<\/strong>: It is the maximum displacement of the particles of the medium from their mean\/original position at rest.<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 189px; width: 229px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image003.jpg\" alt=\"u11l2a2.gif\" \/><\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_How_are_the_wavelength_and_frequency_of_a_sound_wave_related_to_its_speed\"><\/span><strong>2. How are the wavelength and frequency of a sound wave related to its speed?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>From the equation: <img decoding=\"async\" style=\"height: 19px; width: 68px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image004.png\" \/><\/p>\n<p style=\"text-align: justify;\">where v = velocity\/speed<\/p>\n<p style=\"text-align: justify;\">n = frequency of wave<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image005.png\" \/>= wavelength of wave<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"3_Calculate_the_wavelength_of_a_sound_wave_whose_frequency_is_220_Hz_and_speed_is_440_ms_in_a_given_medium\"><\/span><strong>3. Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m\/s in a given medium.<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Since we know <img decoding=\"async\" style=\"height: 19px; width: 59px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image006.png\" \/><\/p>\n<p style=\"text-align: justify;\"><strong><img decoding=\"async\" style=\"height: 19px; width: 101px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image007.png\" \/> <\/strong><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 15px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image005.png\" \/>= 440\/220 = 2 m<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"4_A_person_is_listening_to_a_tone_of_500_Hz_sitting_at_a_distance_of_450_m_from_the_source_of_the_sound_What_is_the_time_interval_between_successive_compressions_from_the_source\"><\/span><strong>4. A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source? <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The time interval between successive compressions from the source<\/p>\n<p style=\"text-align: justify;\">T = 1\/<img decoding=\"async\" style=\"height: 19px; width: 9px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image008.png\" \/> = 1\/500 = 0.002 second.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_Distinguish_between_loudness_and_intensity_of_sound\"><\/span><strong>1. Distinguish between loudness and intensity of sound. <\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong><\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" id=\"Picture 24\" style=\"height: 183px; width: 651px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image009.png\" \/><\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_In_which_of_the_three_media_air_water_or_iron_does_sound_travel_the_fastest_at_a_particular_temperature\"><\/span><strong>1. In which of the three media, air, water or iron, does sound travel the fastest at a particular temperature?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Sound will travel the fastest in iron at a particular temperature.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_An_echo_returned_in_3_s_What_is_the_distance_of_the_reflecting_surface_from_the_source_given_that_the_speed_of_sound_is\"><\/span><strong>1. An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is<img decoding=\"async\" style=\"height: 21px; width: 68px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image010.png\" \/>?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Speed of sound = distance\/time<\/p>\n<p style=\"text-align: justify;\">therefore, distance travelled by sound during echo = <img decoding=\"async\" style=\"height: 21px; width: 83px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image011.png\" \/><img decoding=\"async\" style=\"height: 19px; width: 65px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image012.png\" \/>= 1026 m<\/p>\n<p style=\"text-align: justify;\">so the distance of reflecting surface = 1026\/2 =513 m<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6><span class=\"ez-toc-section\" id=\"1_Why_are_the_ceilings_of_concert_halls_curved\"><\/span><strong>1. Why are the ceilings of concert halls curved?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>The ceilings of concert halls are curved because such architecture helps the sound to reach all the corners and places of concert hall.<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_What_is_the_audible_range_of_the_average_human_ear\"><\/span><strong>1. What is the audible range of the average human ear?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>20 Hz to 20,000Hz.<\/p>\n<hr \/>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"2_What_is_the_range_of_frequencies_associated_with\"><\/span><strong>2. What is the range of frequencies associated with<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>(a) Infrasound?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>(b) Ultrasound?<\/strong><\/p>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Infrasound = less than 20 Hz<\/p>\n<p style=\"text-align: justify;\">Ultrasound = greater than 20 KHz<\/p>\n<hr \/>\n<p style=\"text-align: center;\">NCERT Solutions for Class 9 Science Sound part 1<\/p>\n<h6 style=\"text-align: justify;\"><span class=\"ez-toc-section\" id=\"1_A_submarine_emits_a_sonar_pulse_which_returns_from_an_underwater_cliff_in_102_s_If_the_speed_of_sound_in_salt_water_is_1531_ms_how_far_away_is_the_cliff\"><\/span><strong>1. A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m\/s, how far away is the cliff?<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h6>\n<p style=\"text-align: justify;\"><strong>Ans. <\/strong>Distance travelled by a sonar pulse = speed of sound in salt water <img decoding=\"async\" style=\"height: 13px; width: 12px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image013.png\" \/> time<\/p>\n<p style=\"text-align: justify;\"><img decoding=\"async\" style=\"height: 19px; width: 91px;\" src=\"https:\/\/media-mycbseguide.s3.amazonaws.com\/images\/static\/ncert\/09\/science\/ch12\/image014.png\" \/>= 1561.62 m<\/p>\n<p style=\"text-align: justify;\">therefore, the distance of cliff from submarine = 1561.62\/2 = 780.81 m<\/p>\n<h2><span class=\"ez-toc-section\" id=\"NCERT_Solutions_for_Class_9_Science\"><\/span>NCERT Solutions for Class 9 Science<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>NCERT Solutions Class 9 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 9 Science includes text book solutions .NCERT Solutions for CBSE Class 9 Science have total 15 chapters. 9 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 9 solutions PDF and Science ncert class 9 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"CBSE_app_for_Class_9\"><\/span>CBSE app for Class 9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>To download\u00a0NCERT Solutions for class 9 Science, Computer Science, Home Science,Hindi ,English, Maths Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through\u00a0<a href=\"https:\/\/play.google.com\/store\/apps\/details?id=in.techchefs.MyCBSEGuide&amp;referrer=utm_source%3Dmycbse_bottom%26utm_medium%3Dtext%26utm_campaign%3Dmycbseads\"><strong>the best app for CBSE students<\/strong><\/a>\u00a0and myCBSEguide website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 9 Science Sound part 1 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class &#8230; <a title=\"NCERT Solutions for Class 9 Science Sound part 1\" class=\"read-more\" href=\"https:\/\/mycbseguide.com\/blog\/ncert-solutions-class-9-science-sound-part-1\/\" aria-label=\"More on NCERT Solutions for Class 9 Science Sound part 1\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":-1,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[281,1377],"tags":[283,1344,216,349],"class_list":["post-4146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ncert-solutions","category-science-cbse-class-09","tag-cbse-study-material","tag-class-9","tag-ncert-solutions","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 9 Science Sound part 1 | myCBSEguide<\/title>\n<meta name=\"description\" content=\"NCERT Solutions for Class 9 Science Sound part 1 in PDF format for free download. 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