Respuesta :

AbhiGhost
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: The correct answer is 5 Hz.

Explanation:

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

[tex]v=f\lambda[/tex]

Here, v is the speed of the wave, f is the frequency of the wave and [tex]\lambda[/tex] 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 [tex]\lambda[/tex]=  8 cm.

[tex] 40 =f(8)[/tex]

[tex] f = 5 Hz[/tex]

Therefore, the correct option is (A).