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
Verified Correct Answer: A.
Physical Principles & Numerical Solution
\(V = \frac{Distance}{time}\)
= \(\frac{50cm}{2s}\)
= 25 cms\(^{-1}\).
\(V = f \lambda\)
\(f = \frac{V}{\lambda}\)
\(f = \frac{25}{5}\)
= 5 Hz
Source: Myschool Past Questions Archive (Record #55098)