Question

The distance between two consecutive crests in a wave train produced in string is 5 m. If two complete waves pass through any point per second, the velocity of wave is:

• A. $2.5m/s$
• B. $5m/s$
• C. $10m/s$
• D. $15m/s$

Answer 1

The correct option is C $10m/s$

Given,

Two consecutive crest =$5m$.

Two wave cross in time, $t=1\sec$

Wavelength = distance between two consecutive crest

$\lambda =5m$

Velocity, $v=\frac{2\lambda }{t}=\frac{2\times 5}{1}=10m{s}^{-1}$

Hence, wave speed is $10m{s}^{-1}$