The equation of a progressive wave is given by, `y = 5 sin pi ((t)/(0.02) - (x)/(20))`m, then the frequency of the wave is

Options

A. 100 Hz
B. 50 Hz
C. 25 Hz
D. 10 Hz

Answer

C

Explanation

`y = 5 sin 2pi ((t)/(2 xx 0.02) - (x)/(40))`
Comparing with `y = A sin 2pi ((t)/(T) - (x)/(lamda))` we get,
`(1)/(T) = (1)/(0.04) :. n = (1)/(T) = (100)/(4) = 25 Hz`