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    • Posted by Shantan Madake 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Khushi Vats 2 years, 6 months ago

    The repeated reflection the results in the persistence of sound is called reverberation. To reduce Rverberation the roofs and the walls of auditorium were generally covered with sound absorbent material like compressed fireboard rough plaster and draperies.

    1Thank You

    Smriti Gupta 2 years, 6 months ago

    The repeated reflection of sound in large halls, auditorium etc,that results in persistence of hearing is called reverberation. It is reduced to a value where it is no longer audible.

    1Thank You

    Jina Nath 2 years, 6 months ago

    The repeated reflection of sound in large halls, auditorium etc,that results in persistence of hearing is called reverberation. It is reduced to a value where it is no longer audible.

    3Thank You

    Khushboo . 2 years, 6 months ago

    Reverberation is the repeating of sound in big enclosed space is called Reverberation Its can reduced by celling walls and by using sound observing material like Vollen and fibers boards

    3Thank You

    Bhawna Sharma 2 years, 6 months ago

    Reverberatin is the repetition of the sound in the medium

    2Thank You

    ANSWER

    • Posted by 10200 Paritosh Sunil Khandare 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Preeti Dabral 2 years, 6 months ago

    1.  According to the Rutherford model, an electron orbiting around the nucleus continuously radiates energy due to the acceleration; hence the atom will not remain stable.
    2. This model could not explain the origin of the line spectra of atoms. Or As electron spirals inwards; its angular velocity and frequency change continuously; therefore it will emit a continuous spectrum.

    0Thank You

    Smriti Gupta 2 years, 6 months ago

    1 According to the Rutherford model, an electron orbiting around the nucleus continuously radiates energy due to the acceleration; hence the atom will not remain stable. 2This model could not explain the origin of the line spectra of atoms. Or As electron spirals inwards; its angular velocity and frequency change continuously; therefore it will emit a continuous spectrum.

    0Thank You

    ANSWER

    • Posted by Subankar Sikdar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Preeti Dabral 2 years, 6 months ago

    When we walk on the ground the force of friction between the sole of our shoe and the ground acts opposite to the direction of our motion. It is this force of friction which gradually wears out the sole of our shoe.

    0Thank You

    ANSWER

    • Posted by Subankar Sikdar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Prachi Singh 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Rahul ._. 2 years, 6 months ago

    Ye paper m nhi ayaga

    0Thank You

    ANSWER

    • Posted by Prachi Singh 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shantan Madake 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    Harshit Tomar 2 years, 6 months ago

    A is false but R is true

    0Thank You

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    • Posted by Truptimayee Kadambala 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Mrunali Salunke 2 years, 6 months ago

    Sound is a form of energy which produce sensation of hearing to our ears sound is produced due to vibration of objects

    0Thank You

    Sneha Panchal 2 years, 6 months ago

    It's is produced by vibration Sensation of hearing in our ear

    0Thank You

    Sarthki Kulkarni 2 years, 6 months ago

    Sound is the form of energy which give us senction of hearing it can be produced by collision of two objects

    0Thank You

    Smriti Gupta 2 years, 6 months ago

    Sound is a form of energy which is produce by the collision of two things

    0Thank You

    Rahul ._. 2 years, 6 months ago

    Sound is a form of energy which is produce by the collision of two things

    1Thank You

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    • Posted by Shivam Sharma 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Drashti Makan 2 years, 6 months ago

    Lysosomes are called as suicide bags

    0Thank You

    Smriti Gupta 2 years, 6 months ago

    Lysosomes

    2Thank You

    Shantan Madake 2 years, 6 months ago

    Lysosomes

    1Thank You

    Parth Goyal 2 years, 6 months ago

    Lysosomes

    1Thank You

    Debayan Kar 2 years, 6 months ago

    Lysosomes are suside bags

    0Thank You

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    • Posted by Subankar Sikdar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Smriti Gupta 2 years, 6 months ago

    250*3.6*100

    1Thank You

    Gowtham Kumar Dk 2 years, 6 months ago

    250*3.6*100

    1Thank You

    ANSWER

    • Posted by Subankar Sikdar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Smriti Gupta 2 years, 6 months ago

    1/2 mole

    0Thank You

    Shivam Sharma 2 years, 6 months ago

    1/2 mole

    1Thank You

    Subankar Sikdar 2 years, 6 months ago

    C) 1/2 mole

    2Thank You

    ANSWER

    • Posted by Samiya Chopra 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Smriti Gupta 2 years, 6 months ago

    7g

    0Thank You

    ANSWER

    • Posted by Sehajpreet Kaur 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Sehajpreet Kaur 2 years, 6 months ago

    In Δ ABC, P and Q are the mid-points of sides AB and BC respectively. ∴ PQ || AC and PQ = 12 AC ( Using mid-point theorem) …..(1) In ΔADC, R and S are the mid - points of CD and AD respectively. ∴ RS || AC and RS = 12 AC ( Using mid-point theorem) …..(2) From equation (1) and (2) , we obtain PQ || RS and PQ = RS Since in quadrilateral PQRs, one pair of opposite sides is equal and parallel to each other , it is a parallelogram. Let the diagonals of rhombus ABCD intersect each other at point O. In Quadrilateral OMQN, MQ || ON (∵ PQ || AC) QN || OM (∵ QR || BD) Therefore, OMQN is a parallelogram. ∴∠MQN=∠NOM and ∠PQR=∠NOM However, ∠NOM=90∘ (Diagonals of a rhombus are perpendicular to each other) ∴∠PQR=90∘ Clearly , PQRS is a parallelogram having one of its interior angles as 90∘ Hence, PQRS is a rectangle.

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    • Posted by Konthoujam _Malemnganbii_Chanu Chanuu 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Smriti Gupta 2 years, 6 months ago

    2

    0Thank You

    Harsh Soni 2 years, 6 months ago

    Tha answer is 2

    0Thank You

    ANSWER

    • Posted by Daksh Agarwal 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Smriti Gupta 2 years, 6 months ago

    35.5 u

    0Thank You

    Srishti Singh 2 years, 6 months ago

    For calculating this firstly u have to see it's mass number and percentage Formula- (Percentage×mass number/100) Calculation:- (75% × 35/100) + (25% × 37/100) =} (2625÷100)+(925÷100) =} (3550÷100) = 35.5u Answer :-. 35.5u *THANK YOU* 😊

    1Thank You

    Akshadeep Meshram 2 years, 6 months ago

    Exam hone wala hai kya tera?

    1Thank You

    ANSWER

    • Posted by B. Wamsi 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    B. Wamsi 2 years, 6 months ago

    Answer Kya ha

    4Thank You

    ANSWER

    • Posted by Gauri Gauri 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shivam Sharma 2 years, 6 months ago

    We get food from plants and animals

    0Thank You

    Gauri Gauri 2 years, 6 months ago

    We get food from plants and animals

    2Thank You

    ANSWER

    • Posted by Disha Bs 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Akshadeep Meshram 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    2Thank You

    Tanisha Chavan 2 years, 6 months ago

    We should wear cotton clothes in hot summer days to keep us cool and comfortable this is due to the following reason: during hot summer we perspire more. Sweat is mainly water the cotton clothes are good absorber of sweat so cotton clothes absorb the sweat produced on our skin quickly and expose it to the atmosphere for evaporation the evaporation of sweat from cotton clothes takes the latent heat of vaporization from our skin in this way our skin loses heat and make us feel cool and comfortable.

    3Thank You

    Rishu Sindhu 2 years, 6 months ago

    Cotton , being a good absorber of water and help in absorbing the sweet

    1Thank You

    Paras Pargaien 2 years, 6 months ago

    Because cotton clothes absorb the swet from our body and also takes heat from our body and from that heat cotton clothes will evaportes that sweet and as we know evaporation vaise colony effect . So, as the swet will evaporate our body feels cool.

    1Thank You

    Shashank J 2 years, 6 months ago

    We will wet

    1Thank You

    ANSWER

    • Posted by Kartik Hacker 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Debayan Kar 2 years, 6 months ago

    What type of questions from you asked

    2Thank You

    ANSWER

    • Posted by Anshu Gupta 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Ekam Choudhary 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    Neeraj Gujjar 001 2 years, 6 months ago

    Gujhar

    1Thank You

    Sakshi Sakshi 2 years, 6 months ago

    Prokaryotic cell diagram

    3Thank You

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    • Posted by Gunjan Dongre 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sudhir Kumar 2 years, 6 months ago

    Which one

    1Thank You

    Ekam Choudhary 2 years, 6 months ago

    😂

    0Thank You

    ANSWER

    • Posted by Deepti S 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Ekam Choudhary 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

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    • Posted by Aman Singh 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Samiya Chopra 2 years, 6 months ago

    2,8,1 K,L,M

    1Thank You

    Rishu Sindhu 2 years, 6 months ago

    2,8,1

    2Thank You

    Sudhir Kumar 2 years, 6 months ago

    2 8 1

    2Thank You

    Smriti Gupta 2 years, 6 months ago

    K L M N 2 8 1

    1Thank You

    Aryan Adarsh 2 years, 6 months ago

    3S¹

    3Thank You

    ANSWER

    • Posted by ༆٭۝AкคSн٭۝࿐ ༆ 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Preeti Dabral 2 years, 6 months ago

    Homogeneous mixture

    Heterogeneous mixture
    It has a uniform composition It has a non-uniform composition
    It has only one phase There are two or more phases
    It can’t be separated out physically It can be separated out physically
    ‘homo’ means the same ‘hetero’ means different
    Example: a mixture of alcohol and water Example: a mixture of sodium chloride and sand

    2Thank You

    Ekam Choudhary 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    1Thank You

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    • Posted by Priyansu Kumar Sahoo 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Akshadeep Meshram 2 years, 6 months ago

    Diversity in living organisms deleted hai syllabus se!

    1Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Phanerogams are flowering plants. Its two groups are Gymnosperms and Angiosperms: Answer: Gymnosperms Angiosperms (i) They produce naked seeds. (ii) Considered more primitive in evolutionaiy term. (i) They produce well protected seeds, inside a fruit. (ii) Considered most highly evolved in evolutionary terms.

    2Thank You

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    • Posted by Anuja Aggarwal 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Priyansu Kumar Sahoo 2 years, 6 months ago

    The nucleus is an organelle found in eukaryotic(having nucleus) cells. Inside its fully-enclosed nuclear membrane, it contains the majority of the cell's genetic material. This material is organized as DNA molecules, along with a variety of proteins, to form chromosomes. The nucleus is made up of a double membrane nuclear envelope that keeps the entire organelle encased, isolating its contents from the rest of the cell, and the nucleoskeleton which supports the cell as a whole. The nucleus maintains the security of the genes and controls the functions of the entire cell by regulating gene expression. This is why the nucleus is sometimes referred to as the control center, or the "brain," of the cell.

    2Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    The nucleus is the center of an atom. Almost all of the mass in an atom is made up from the protons and neutrons in the nucleus with a very small contribution from the orbiting electrons. Neutrons have no charge and protons are positively charged. Nucleus is highly dense because of the whole mass of atom is concentrated in the nucleus, with electrons contributing negligible mass.

    2Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    What is the nucleus? The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles. Outline the structure of the Nucleus. A double-membraned organelle known as the nuclear membrane/envelope engirdles the nucleus. The nucleolus is found within the nucleus, occupying 25% per cent of the volume. Thread-like, dense structures known as chromatins are found within the nucleus containing proteins and DNA. The mechanical strength for the nucleus is provided by the nuclear matrix, a network of fibres and filaments which performs functions similar to the cytoskeleton.

    2Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    The nucleus (plural, nuclei) is a positively charged region at the center of the atom. It consists of two types of subatomic particles packed tightly together. The particles are protons, which have a positive electric charge, and neutrons, which are neutral in electric charge.

    3Thank You

    Aryan Singh 2 years, 6 months ago

    Nucleus which means it's a small entity of atom where proton and neutron were merged. Its contain whole mass of an atom.

    2Thank You

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    • Posted by Garvit Khunteta 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Dendrite Dendrites are long structures that connect nerve cells (neurons). These take up a lot of space on a neuron’s surface. They receive a large number of messages from other neurons and have specialised proteins that receive, process, and send these signals to the cell body. Organelles in dendrites allow them to modify protein density in response to changes in neuronal input frequency. This permits neurons to retain normal activity, which helps to prevent neurological illnesses like epilepsy. Dendrites are therefore essential for appropriate neuronal function and play a key part in physiological processes including memory formation . Function of dendrite Dendrites have the ability to accept impulses from other neurons, process them, and transmit the information to the neuron’s soma.

    1Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Dendrites: Many short fibres called dendrons arise from the cell body of neuron. They further divide to form dendrites. Dendrites receive messages from other neurons.

    1Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Dendrites are the finger-like cells present on the end of a neuron. They are short, branching fibres extending from the cell body of the nerve cell. This fibre increases the surface area available for receiving incoming information.

    1Thank You

    ANSWER

    • Posted by Monendra Singh 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Priyansu Kumar Sahoo 2 years, 6 months ago

    It is also defined as the amount of energy transferred or converted per unit time. P o w e r = W o r k d o n e T i m e t a k e n. The SI unit of power is watt. One watt is 1 joule per second.

    1Thank You

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    • Posted by Debayan Kar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Debayan Kar 2 years, 6 months ago

    Priyanshu don't copy Full page

    1Thank You

    Aditi Vidhuri 2 years, 6 months ago

    Balanced force - If a number of force are acting on a body and the body does not move than the forces are set to be Balanced force. Unbalanced force - If the resultant of force acting on a body is non-zero, the state of rest or motion of the body changes, such force acting on a body are called Unbalanced force

    1Thank You

    ANSWER

    • Posted by Debayan Kar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Akshadeep Meshram 2 years, 6 months ago

    Stop confusing him with wrong answers! Actually, negative acceleration means the acceleration in the opposite direction of motion For understanding this you need to understand about sign convention in physics, For example:- If a body is moving in north direction with a constant velocity, you assume that the north direction is positive Therefore, the south direction will be negative When the body was moving in the north direction(positive direction), the velocity will be positive and if the body will move in the south direction its velocity will get negative. This happens because the velocity is a vector quantity and it needs magnitude and direction also it does not depend on decreasing or increasing of magnitude in depends also on the direction The same applies on the acceleration also if a body is accelerating in the positive direction is side acceleration will be positive and give the body will accelerate in the negative direction it acceleration will be negative For example:- a car is moving with a constant acceleration in the positive direction if the driver applies the break the car will have a retardation and hence after sometime the car will stop But in reality the brakes accelerate in the opposite direction of the motion and by various factors like friction brings to rest Your school teachers will tell you that retardation is the decreasing of velocity but in reality it is the acceleration only but in the opposite direction This will help you in your 11th class and 12th also but if you will follow this you will definitely face many problems in your class

    0Thank You

    Debayan Kar 2 years, 6 months ago

    Rate of change of velocity with time at a negative rate is called negative acceleration

    1Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Negative acceleration: A body is said to be in negative acceleration when its velocity is getting reduced with respect to time. Example: Slow down of car on the application of brakes. Thus, speeding up a car is an example of positive acceleration and slowing down a moving vehicle is an example of negative acceleration.

    0Thank You

    Yashmay Saroj37 2 years, 6 months ago

    decrease in the change of velocity of a body per unit time

    0Thank You

    ANSWER

    • Posted by Debayan Kar 2 years, 6 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Debayan Kar 2 years, 6 months ago

    Rate of change of velocity with positive rate is called positive acceleration

    1Thank You

    Priyansu Kumar Sahoo 2 years, 6 months ago

    Hint:Let us first discuss acceleration before moving on to the question. In mechanics, acceleration is the rate at which an object's velocity changes with respect to time. The term "acceleration" refers to a quantity that is measured in vectors (in that they have magnitude and direction). The direction of an object's acceleration is determined by the orientation of the net force acting on it. Complete answer: The term "positive acceleration" refers to a speed increase over time. The term "negative acceleration" refers to a decrease in speed over time. It's a stumbling block. Positive acceleration occurs when the vehicle's speed increases. The speed of the car diminishes as it slows down. When an object accelerates in the same direction as its velocity, the acceleration is in the same direction as the velocity. As a result, this object is moving at a positive rate. Additional information: Accelerometer is a device that measures the rate at which an object's velocity changes (i.e., its acceleration). Acceleration cannot be directly measured. As a result, an accelerometer monitors the force imposed by constraints on a reference mass in order to keep its location stable in an accelerating body. The link between constraint force and acceleration defined by Newton's second law is used to calculate acceleration: force = mass×acceleration . Note:The usage of positive and negative in physics always has a physical significance. It's more than just a mathematical notation. Positive and negative describe a direction when used to describe the velocity and acceleration of a moving object. Both velocity and acceleration are vector numbers, which necessitate the employment of a directional word to fully describe them.

    0Thank You

    Piyush Kumar 2 years, 6 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    • Ask specific question which are clear and concise.

    Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

    0Thank You

    Aditi Vidhuri 2 years, 6 months ago

    The rate of change of velocity with time is called acceleration.

    2Thank You

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