A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator
-
A.
5Hz -
B.
6Hz -
C.
5.2Hz -
D.
25Hz
Correct Answer: Option A
Explanation
(V = frac{Distance}{time})
= (frac{50cm}{2s})
= 25 cms(^{-1}).
(V = f lambda)
(f = frac{V}{lambda})
(f = frac{25}{5})
= 5 Hz
There is an explanation video available below.