A traveling wave passes a point of observation.At this point,the time between successive crests is 0.2 s.Which of the following statements can be justified?
A)The wavelength is 5 m.
B)The frequency is 5 Hz.
C)The velocity of propagation is 5 m/s.
D)The wavelength is 0.2 m.
E)There is not enough information to justify any of these statements.

Question

Quizplus · Accepted Answer

The frequency (f) of a wave is the number of crests (or any other point on the wave) that pass a given point in one second. 
Using the formula f = 1/T where T is the time period (time between successive crests), we get:
f = 1/0.2 s
f = 5 Hz
Therefore, statement B is justified. The other statements cannot be justified based on the given information.

A Traveling Wave Passes a Point of Observation