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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.
The frequency of a source of sound is $100$ Hz. How many times does it vibrate in a minute?
9.
Does sound follow the same laws of reflection as light does? Explain.
10.
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?
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Top Tutors who teach CBSE - Class 9 Science Sound

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Knowledge and experience is everything 1stly take a demo and you will get to know what i Teach
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20 yrs of Exp
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Rakesh R Sound in Kolkata
(43)
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15 yrs of Exp students 44 students
55 hrs of classes completed
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He is not responding to our calls, no WhatsApp, no class for 1 week. We got fed up with this.

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Bhavana W. Sound in Bhopal
(61)
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Decent communication skills with easy technique of study with 5 yrs of teaching experience.
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Bhavna ma'am is an empathetic, compassionate and a visionary teacher. She is meticulous in her work, always checking every detail to ensure accuracy with an obscene amount of knowledge. Her explanations are clear and insightful with a comical twist and her classes are a safe space for intellectual curiosity. She really is an inspirational teacher.

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