What do you understand by free vibrations of a body?
Why are the Ultrasonic waves are not audible to us?
Give one reason for Ultrasonic waves use for echo depth sounding purpose.
State one way of increasing the frequency of a note produced by an air column.
Name the waves used for echo depth sounding
State the ways by which the frequency of transverse vibrations of a stretch string can be increased
What is meant by the natural frequency of vibration of a body?
On What factors does the natural frequency of vibration of a body depend?
