Question

(i) Define the time period of a wave. 

(ii) Give the relation among speed of sound v, wavelength λ and its frequency f. 

(iii) A sound wave travels at a speed of 339 ms–1. If its wavelength is 1.5 cm, what is the frequency of the wave?

Answer 1

(i) Time period (T) 

It is defined as the time required to complete one wave. 

(ii) Speed of sound (v) = Wavelength ( λ ) × Frequency ( f ) 

(iii) Given, 

Speed of sound, v = 339 ms^–1 

Wavelength, λ = 1.5 cm= 0.015m

Since, Velocity = Wavelength × Frequency 

Therefore, Frequency = velocity / wavelength = 339 / 0.015 = 22600 The frequency of wave = 22600 Hz