Question

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.107sec. The frequency of wave is?

(a) 0.73Hz

(b) 0.36Hz

(c) 1.47Hz

(d) 2.94Hz

The question was posed to me in a national level competition.

Enquiry is from Sounds and Waves in section Waves of Engineering Physics I

Answer 1

Correct choice is (c) 1.47Hz

To explain: Time taken in moving from maximum displacement to zero displacement is

T/4=0.170s or T=0.68s

Frequency,

v=1/T=1/0.67=1.47Hz.