The S.I unit of frequency is

Back and forth motion of an object is called

A musical instrument which produces sound by blowing air in to it is called

Voice box is also called as

Sound of frequency lower than 20Hz is called

Larnyx of human produces

The velocity of sound is approximately equal to

The number of vibrations made by a vibrating body in one second is called

A pendulum oscillate 20times in 4 second, its time period is

Loudness is sound is determined

Sound cannot travel through

The hearing range of human ear is

Pitch of a sound is determined by

Sound is a kind of

The speed of sound is maximum in

Time taken by the body to complete one oscillation is called

Plantation on the road side can reduce

The speed of sound is lesser the

The sounds which is melodious to ear is called