Sound Test - 43...

A man can hear the sound of frequency:

Low sound such as normal breathing has loudness up to 

The sound in the audible range is called 

Relation between frequency and time period is 

The sound of frequency less than $$20\ Hz$$ is known as:

A pendulum oscillates $$20$$ times in $$2$$ seconds then its time period is 

In a clock, the time period of hour hand is :

The time period of the second hand in a clock is :

The siren of an ambulance needs to be a loud and piercing sound. Therefore, its main characteristics should be:

.......... is the number of vibrations of a body in one second.