Question

The period of a mechanical wave is 5 seconds. what is the frequency of the wave?

Answer 1

The frequency of a wave is just the reciprocal of the period.
For this one . . .

     Frequency  =  1/(period)  =  1/(5 sec)  =  0.2 per sec (0.2 Hz) .

Answer 2

Answer:

Frequency of the wave is 0.2 Hz.

Explanation:

It is given that, the period of a mechanical wave is 5 seconds. We have to find the frequency of the wave. Time period of a wave is defined as the time taken by the wave to complete one cycle and the number of oscillations or vibrations in a medium is called the frequency of the wave.

The relationship between the time period and the frequency of the wave is given by :

$f=\dfrac{1}{T}$   T = time period

$f=\dfrac{1}{5\ s}$      

f = 0.2 Hertz

Hence, the correct option is (c) " 0.2 Hz ".