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NCERT-SOUND -Exercise
- Why are the ceilings of concert halls curved ?
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- What is the audible range of the average human ear ?
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- What is the range of frequencies associated with (a) infra sound (...
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- A submarine emits a sonar pulse, which returns from an underwater clif...
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- What is sound and how is it produced ?
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- Describe with the help of a diagram, how compressions and rarefactions...
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- Cite an experiment to show that sound needs a material for its propaga...
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- Why is sound wave called a longitudinal wave ?
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- Which characteristic of the sound helps you to identify your friend by...
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- Flash and thunder are produced simultaneously. But thunder is heard a ...
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- A person has a hearing range from 20 Hz to 20 kHz. What are the typica...
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- Two children are at opposite ends of an aluminium rod. One strikes the...
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- The frequency of a source of sound is 100 Hz. How many times does it v...
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- Does sound follow the same laws of reflection as light does ? Explain.
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- When a sound is reflected from a distant object, an echo is produced. ...
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- Give two practical applications of reflection of sound waves.
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- A stone is dropped from the top of a tower 500 m high into a pond of w...
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- A sound wave travels at a speed of 339 m//s. If its wavelength is 1.5 ...
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- What is reverberation ? How can it be reduced ?
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- What is loudness of sound ? What factors does it depend on ?
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