A plane progressive wave is represented by the equation y = 0.2sin (200\pit - 0.5.x) where x and y are measured in cm and t in s. What is the frequency of the wave?
A
0.5Hz
B
4.0Hz
C
10.0Hz
D
100.0Hz
E
200.0Hz
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Comparing y = 0.2sin (200\pit - 0.5.x) with the general equation of wave y = Asin(\omegat - kx)
\omega = 200\(\pi\)
But \omega = 2\(\pi\)f = 200\(\pi\)
f = \(\frac{200\pi}{2\pi}\) = 100Hz
Source: Myschool Past Questions Archive (Record #43054)