CLASS 8
PT3
SOUND
1. What are the causes of noise pollution?
2. Which part of ear vibrates to produce sound?
3. Define ultra and infrasonic sounds.
4. What is the relation between loudness and amplitude of sound?
5. Write some applications of ultrasound in daily life.
6. How is the sound propagated?
7. A pendulum oscillates 50 times is 5 seconds. Find its time perio
6. Draw the structure of human ear and explain its functioning.
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Answer:
Ans-1 = Causes of the noise pollution are- Radio, Loud speakers, television etc.
Ans-2 = Eardrums
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