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Free CBSE - Class 9 Science - Sound worksheets

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1.
What is sound and how is it produced?
2.
Describe with the help of a diagram, how compressions and rarefactions are produced in air near a source of sound.
3.
Why is sound wave called a longitudinal wave?
4.
Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?
5.
Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen, why?
6.
A person has a hearing range from $20$ Hz to $20$ kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as $344$ m s$^{-1}$.
7.
Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
8.
Does sound follow the same laws of reflection as light does? Explain.
9.
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
10.
Give two practical applications of reflection of sound waves.
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Top Tutors who teach CBSE - Class 9 Science Sound

Jayesh Chaudhari Sound in Mumbai
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Ramu Nutakki

Very patient. Makes learning fun and productive. A seasoned and competent teacher. Makes a subject as mind-bogging as Math very easy to understand. Awesome experience!

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Sai V. Sound in Madappanahalli
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The teacher though good in teaching but does not carry responsiveness in completing the paid classes, nor he is responsive the calls. He will abruptly discontinue the class; he will not attend the paid & planned classes where the kid is sitting for class. He never feels to call back. Please be careful.

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