Question

please help urgently​

Answer 1

Time Period

• The time taken by a particle of medium to complete its one vibration is called the time period of the wave.
• or
• time period is the time taken by a vibrating body to complete one oscillation
• time period is represented by the letter T. 
• second (s) is the SI unit of time period.

Audible Sound

A Sound that is loud enough to be heard.