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What is a vibration (or an oscillation)? Define 'amplitude' of vibration of an object.

The to- and – fro motion of an object in a medium is called vibration.

Amplitude is the largest distance from the mean position of the object.

Name one animal which can produce ultrasonic sounds.

Name two animals which can hear ultrasonic sounds.

What is the frequency of a vibrating body whose time-period is 0.05 second ?

State two methods of producing sound.