Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 5 - Sound

Question 47 Exercise

a) Name four ways in which sound can be produced.

b) Calculate the speed of a sound wave whose frequency is 2 kHz and wavelength 65 cm.


a) Following are the ways in which sound can be produced:

i) by vibrating the strings

ii) by vibrating membranes

iii) by vibrating the plates

b) Speed of sound wave = (frequency)(wavelength)

Frequency, f = 2 kHz

Wavelength, λ = 65 cm = 0.65 m

Therefore, speed = 1300 m/s

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