Give an ill effect of noise pollution

2

(a)

A hearing aid that is attached to the ear helps people who suffer from hearing loss. What is the main function of the hearing aid?

2

(a)

What is the name of the strings which vibrates and voice box when we talk?

2

(a)

What is the difference between pitch and frequency?

2

(a)

What is ultrasound?

2

(a)

What is the frequency of wave with time period 0.025 s?

2

(a)

A baby recognises her mother by her voice. Name the characteristic of sound involved.

2

(a)

Why do we not hear the sound of an explosion on the surface of the moon?

2

(a)

Paheli : When we speak, do we also vibrate any part of our body

2

(a)

Can you say that the frequency of the voice of a child is higher than that of an adult?

2

(a)

How can we recognize many familiar sounds without seeing the objects producing them?

2

(a)

Why are the voices of men, women and children different?

2

(a)

Compare the sound of drum and whistle.

2

(a)

Sound needs a medium for propagation. Explain it with an experiment

2

(a)

What is ultrasound? What are its uses?

2

(a)