Name three animals which can hear ultrasonic vibrations.

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Certain creatures like dogs, bats, dolphins, and mosquitoes can detect the waves.

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Chapter 5: Acoustics - Evaluation [Page 72]

Chapter 5 Acoustics
Evaluation | Q IX. 3. c) | Page 72

Fill in the blank.

We can hear sounds of frequency in the range of _______

Draw a graph between displacement from mean position and time for a body executing free vibrations in vacuum.

Are sound waves longitudinal or transverse?

Explain the terms 'compressions' and 'rarefactions' of a wave. What type of waves consist of compressions and rarefactions.

When we change a feeble sound to a loud sound, we increase its :

Complete the following sentences :

Sound cannot travel through __________, but it requires a ___________.

A bat emits an ultrasonic sound of frequency 0.25 MHz. Calculate the time in which one vibration is completed.

Can you hear each other in a dark room?

Name the waves used for sound ranging. State one reason for their use.