A) 20m/s
B) 30m/s
C) 15m/s
D) 25m/s
Correct Answer: A
Solution :
Let wave velocity = v \[v=\lambda f\] The given equation of wave \[y=3\,\sin \,\left[ 2\pi \left( \frac{x}{20}-\frac{t}{0.01} \right) \right]\] Compare the given equation with standard equation \[y=A\,\,\sin \left[ 2\pi \left( \frac{x}{\lambda }-\frac{t}{T} \right) \right]\] We get, A = 3 cm \[\lambda =20cm\] \[f=\frac{1}{T}=100\,Hz\] \[\therefore \,\,\,v=\lambda f=\frac{20\times 100}{100}=20\,m/s\]You need to login to perform this action.
You will be redirected in
3 sec