Question

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

• A. $15cm{s}^{-1}$
• B. $10cm{s}^{-1}$
• C. $2.5cm{s}^{-1}$
• D. $5cm{s}^{-1}$

Answer 1

Answer: (B)

$10cm{s}^{-1}$

Wavelength $\lambda =$ distance between two consecutive crests $=5cm.$
Frequency $\nu =2$. Hence $v=\nu \times \lambda =10cm/s$