Question

A source of frequency 500 Hertz. emits waves of wavelength 0.2 m. The time the wave takes to travel a distance of 300 m is.

• A. 75 seconds
• B. 60 seconds
• C. 12 seconds
• D. 3 seconds

Answer 1

Answer: (D)

3 seconds

We know that the wave velocity $v=f\lambda =500\times 0.2=100m/s$

Thus using $S=vt,$ time taken for travel 300 m, $t=S/v=300/100=3s$