Question

A wave is moving at the rate of 40 cm/s. Its wavelength is 8cm. What is the frequency of the wave?

A. 5 Hz
B. 320 cm
C. 5 cm
D. 320 Hz

Answer 1

Frequency of wave = speed of wave/wavelength
= 40/8
= 5 Hz.

Hence option A is correct.

Hope this helps, have a great day/night ahead!

Answer 2

Answer: The correct answer is 5 Hz.

Step-by-step explanation:

The expression for the relation between the speed and wavelength is as follows:

`v=f\lambda`

Here, v is the speed of the wave, f is the frequency of the wave and
`\lambda` is the wavelength.

In the given problem, a wave is moving at the rate of 40 cm/s. Its wavelength is 8 cm.

Put v= 40 cm/s and
`\lambda`= 8 cm.

`40 =f(8)`

`f = 5 Hz`

Therefore, the correct option is (A).