Question

A longitudinal wave has a compression to compression distance of 10 m. It takes the wave 5 s to pass a point. Find the velocity of wave.

• A. 2 m/s
• B. 3 m/s
• C. 4 m/s
• D. 6 m/s

Answer 1

Answer: (A)

2 m/s

The speed of wave is given by

$v=\nu \lambda$

where, v is the speed of the wave,$\nu$ is the frequency of wave and

$\lambda$ is its wavelength.

But, $\nu =\frac{1}{T}$

where T is a period of propagation of the wave.
Hence,

$v=\frac{\lambda }{T}$

$v=\frac{10}{5}=2m{s}^{-1}$