The equation of a plane progressive is given by y = 0.025 sin (100 t + 0.25 x). The frequency of this wave would be :

Options

A. 50 Hz
B. 100 Hz
C. `(50)/(pi)` Hz.
D. None of these.

Answer

C

Explanation

y = 0.025 sin (100 t + .25 x)
compare it with standard form
y = r sin `(omega t + kx)`
`omega = 100 sec^(-1)`
`2pi v = 100 " " rArr " " v = (100)/(2 pi) = (50)/(pi ) `Hz.
Correct choice is (c) .