Question

The equation of progressive wave is $y=0.2 \sin 2 \pi\left[\frac{t}{0.01}-\frac{x}{0.3}\right]$, where $x$ and $y$ are in metre and t is second. The velocity of propagation of the wave is

• A. 30 m/s
• B. 40 m/s
• C. 300 m/s
• D. 400 m/s

Answer 1

Answer: (A)

30 m/s

Answer 2

$v =\frac{\text { coefficient of } t }{\text { coefficient of } x }=\frac{2 \pi / 0.01}{2 \pi / 0.3}=30 \,m / s$