Sound

Question 1

Frequency

Answer 1

Frequency is defined as the number of vibrations per unit time. Frequency is measured in hertz (Hz.)

Question 2

Time period

Answer 2

Time period is the time taken to complete one oscillation

Question 3

What is the audible range of human hearing?

Answer 3

The audible range of human ears is 20 herts to 20,000 hertz

Question 4

Noise pollution

Answer 4

Excessive or unwanted sound in the environment is called noise pollution

Question 5

What is the speed of sound?

Answer 5

Speed of sound in air is 340 m per second approximatley

Question 6

What is the speed of light?

Answer 6

Speed of light is 3,00,000 km/s or 3 x 10 to the power 8 m/s

Question 7

What is vibrations?

Answer 7

Back and forth motion of an object is called vibrations

Question 8

Why can’t we see most of the vibrations?

Answer 8

In some cases the vibrations are easily visible to us. But in out cases the amplitude is so small that we cannot see them but only feel them.