Question

The distance between two consecutive crests in a wave train produced in a string is 5 cm. If 2 complete waves pass through any point per second, the velocity of the wave is

• A. 10 cm/sec
• B. 2.5 cm/sec
• C. 5 cm/sec
• D. 15 cm/sec

Answer 1

The correct option is A 10 cm/sec

The distance between the two crests is the wavelength. So, wavelength is =$5cm$.

The frequency of wave is $=2Hz$.

The velocity of the wave is given by:

$v=n\lambda$

$=2\times 5=10cm/sec$