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    • Posted by Shaikh Osama 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shaikh Osama 5 years, 7 months ago

    Speed of electrics power

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    • Posted by Omkar Rajwade 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Omkar Rajwade 5 years, 7 months ago

    I want molybdenum configuration

    0Thank You

    Rajneesh Payal 5 years, 7 months ago

    Magnesium 2,8;2

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    • Posted by Sumit Gupta 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    Velocity – Time Graphs:

    The variation in velocity with time for an object moving in a straight line can be represented by a velocity-time graph. In this graph, time is represented along the x-axis and the velocity is represented along the y-axis. If the object moves at uniform velocity, the height of its velocity-time graph will not change with time. It will be a straight line parallel to the x-axis. To determine the distance moved by the car from its velocity-time graph, the area under the velocity-time graph gives the distance (magnitude of displacement) moved by the car in a given interval of time.

     

    For example, if the car would have been moving with uniform velocity, the distance travelled by it would be represented by the area ABCD under the graph. Since the magnitude of the velocity of the car is changing due to acceleration, the distance s travelled by the car will be given by the area ABCDE under the velocity-time graph.

    That is,

    s =  area ABCDE =  area of the rectangle ABCD + area of the triangle ADE

    =  AB × BC + 1/2 (AD × DE)

    In the case of non-uniformly accelerated motion, velocity-time graphs can have any shape.

    Speed of a body is defined as the distance travelled by the body in unit time.

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    • Posted by Sumit Gupta 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    Pitch is that characteristic of sound by which we can distinguish between different sounds of the same loudness. 

    The sound within a range of 20 hertz to 20,000 hertz is called audible sound.

    The  phenomenon  of  persistence  or  prolongation  of  audible  sound  after  the  source  has  stopped emitting it is called reverberation.

    The word SONAR stands for Sound Navigation And Ranging. Sonar is a device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects. Sonar consists of a transmitter and a detector and is installed in a boat or a ship.

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    • Posted by Aakarsh Singhal 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Rajneesh Payal 5 years, 7 months ago

    Power

    0Thank You

    Aparna Chaturvedi 5 years, 7 months ago

    Power

    1Thank You

    Akash Kumar 5 years, 7 months ago

    The rate of doing work by a machine is called power

    1Thank You

    Sumit Gupta 5 years, 7 months ago

    is called power

    1Thank You

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    • Posted by Balkaran Singh 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Rahul Kumar 5 years, 7 months ago

    The magnitude of the maximum disturbance in the medium on either side of the mean value is called Amplitude

    1Thank You

    Sumit Gupta 5 years, 7 months ago

    The maximum desplacement above and below the mean position is called amplitude

    1Thank You

    Aakarsh Singhal 5 years, 7 months ago

    The max displacement of a particle from its mean position

    1Thank You

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    • Posted by Anushka Yadav 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Anushka Yadav 5 years, 6 months ago

    Thanks

    0Thank You

    Pulkit Kumawat 5 years, 7 months ago

    Atomic mass is the mass of an element .It's unit is g

    1Thank You

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    • Posted by Yash Goswami 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Warrior Gamers 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Rajneesh Payal 5 years, 7 months ago

    Hg

    0Thank You

    Mansi Class12 5 years, 7 months ago

    Hg

    1Thank You

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    • Posted by Warrior Gamers 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Mansi Class12 5 years, 7 months ago

    Bouncing back of soundwaves from the surface of solid or liquid is known as a reflection of sound. Reflection of sound is responsible for many interesting phenomena such as Echoes and Reverberation. Like the reflection of light, the reflection of Sound follows laws too. Reflection of sound is based on the two laws and they are: The incidence angle is always equal to the reflection angle. The incident sound wave, the normal, and the reflected wave, all rest in a common plane. Following are the practical applications of reflection of sound waves are: (a) Reflection of sound is used to measure the distance and speed of underwater objects. This method is known as SONAR. (b) Working of a stethoscope is also based on reflection of sound. In a stethoscope, the sound of the patient’s heartbeat reaches the doctor’s ear by multiple reflections of sound. (c) The working of hearing aid is based on the reflection of sound. In hearing aid the sound waves are reflected into a slimmer area so as to direct the sound to the ear. (d) The soundboard is based on the reflection of sound. Here, the sound waves are uniformly reflected can be seen in the auditorium. This helps in improving quality.

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    • Posted by Rajendra Kumar Poddar 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Anmol Sonkar 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Rajneesh Payal 5 years, 7 months ago

    CN-

    0Thank You

    Anmol Sonkar 5 years, 7 months ago

    CN-

    2Thank You

    Anmol Sonkar 5 years, 7 months ago

    _ CN

    1Thank You

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    • Posted by Krishna Tyagi 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Heer Sanghvi 5 years, 7 months ago

    1. Differentiated body structure - leaves, stems, roots etc. 2. Vascular tissues are present. 3. Reproduce through spores. 4. Example- fern, horsetails. Gymnosperm and angiosperm is known as pteridophyte

    1Thank You

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    • Posted by Mini Pawar 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    A K47 5 years, 7 months ago

    Of oxygen= O = 16g (mass).given mass 12g. So, 12/16 = 0.75 moles. Of water or h2o = mass = 18g. Given mass 22g. so, 22/18 = 1.22 moles.

    1Thank You

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aanchal Pal Arya 5 years, 7 months ago

    A=Na2o B=Al2o3

    0Thank You

    Nitin Melkani 5 years, 7 months ago

    NAO and

    0Thank You

    ANSWER

    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Arjun Gupta 5 years, 7 months ago

    Ozone - is three as it contains 3 atoms of oxygen (O3) Sodium - is 1 as it is made up of only NA

    1Thank You

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    A K47 5 years, 7 months ago

    Evaporation is a process in which liquid gets converted into gas at room temperature and atmospheric pressure.wind,surface area,temperature affects rate of evaporation.

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Heer Sanghvi 5 years, 7 months ago

    The amount of heat energy that is required to change 1 kg of liquid into gas. So, this process is known as latent Heat of vaporisation

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    • Posted by Garv Bhavya 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

    The latent heat of vapourisation of a liquid is the quantity of heat in joules required to convert 1 kilogram of the liquid or gas, without any change in temperature.

    After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporisation of water helps to cool the hot surface

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    • Posted by Aditya Kumar 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by S.Kavitha Achary Kavitha Achary 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Taabish Khan 5 years, 7 months ago

    Atoms of same element and same atomic number but different atomic mass

    2Thank You

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    • Posted by Hifzul Hasan Khan 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Heer Sanghvi 5 years, 7 months ago

    Human ears Amoeba Spirogyra Paramecium

    2Thank You

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    • Posted by Pankaj Vishwakarma 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Taabish Khan 5 years, 7 months ago

    . the ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells. "immunity to typhoid seems to have increased spontaneously"

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    • Posted by Rakesh Patel 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Arul Tyagi 5 years, 7 months ago

    Angiosperms produce covered seed .Seed developed inside the ovary which matures into fruit while gymnosperm have naked seeds that is seeds are not enclosed inside fruit.

    1Thank You

    Pushp Bansal 5 years, 7 months ago

    Angiosperms are flower bearing plants Gymnosperms are seed bearing plants

    0Thank You

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    • Posted by Sunny Singh 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Sunny Singh 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Sumit Gupta 5 years, 7 months ago

    The frequency of an amitad sound is called pitch. loudnes is the mager of responce of the ear to the sound

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    • Posted by Pranshu Soni 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Pranshu Soni 5 years, 7 months ago

    2

    1Thank You

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    • Posted by Khushi Singh 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Pradeep Bhargande 5 years, 7 months ago

    6000Hz

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    • Posted by Naina Choudhary. 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Lillima Amit 5 years, 7 months ago

    And therefore no amount of momentum loss and get conserved

    0Thank You

    Sagar Yadav 5 years, 7 months ago

    According to the law of conservation of momentum,the initial momentum is equal to the final momentum.

    1Thank You

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    • Posted by Deepak Prajapati 5 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 5 years, 7 months ago

     The Oxygen-Cycle: 21% of Oxygen is found in the elemental form in the atmosphere. It also occurs extensively in the combined form in the Earth’s crust as well as also in the air in the form of carbon dioxide. In the crust, it is found as the oxides of most metals and silicon, and also as carbonate, sulphate, nitrate and other minerals. It is an essential component of most biological molecules like carbohydrates, proteins, nucleic acids and fats (or lipids). The oxygen-cycle is the cycle that maintains the levels of oxygen in the atmosphere. Oxygen from the atmosphere is used up in three processes, namely combustion, respiration and in the formation of oxides of nitrogen. Oxygen is returned to the atmosphere by photosynthesis.

    1Thank You

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