Q3 of 16 Page 22

Answer the following:

Why is sound a longitudinal wave?

Sound waves are longitudinal waves because during compression and rarefaction, the particles of the medium vibrate parallel to the direction of propagation of the sound wave.


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2

Fill in the blanks with suitable words :

The SI unit of wavelength is ____________ .

 2

Fill in the blanks with suitable words :

The velocity of sound in air at 25 °C is approximately ________.

 3

Answer the following:

Explain an activity to show that sound can do work.

 3

Answer the following:

Describe an activity to show that sound is produced by vibration of materials.