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If we talk softly, a person standing far...

If we talk softly, a person standing far away cannot hear us. Explain why ?

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The amplitude of soft sound is very less, hence we cannot heat this sound from far away.
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  3. At what frequency we can't the sound of vibra-tions of a pendulum ?

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  5. SONAR is

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  9. List sources of noise pollution in your surroundings.

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  11. Why are the walls of halls and auditoriums covered with soft materials...

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  12. Do all bodies produce sound ?

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  13. Which organ in the human body produces sound ?

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  14. If we talk softly, a person standing far away cannot hear us. Explain ...

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  16. Assertion : The sound produced by a flute is shriller than the sound p...

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  17. Assertion : Sound waves do not travel through vacuum. Reason : The s...

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  18. Assertion : Every vibrating body is a source of sound. Reason : All ...

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