Correct answer only !

the hum (sound wave) you may have heard from a transformer has a frequency of about 100 hz and a wavelength of 3.4 m. how fast does the hum travel?

remember that v= λ ∙ f

The speed of the sound wave is 340 m/s. The correct option is C.

Here in question description the frequency and wave length is given and we have to find the velocity/speed of the sound wave.

Frequency is the time taken for the passage of one wave. Wavelength is the total length of crust and trough in meters.

The velocity is the product of frequency and wavelength.

V =  λ ∙ f

By putting the values in given formula:

v = 100 Hz × 3.4 m = 340 m/s

Hence the speed of the wave is 340 m/s.

amplitude

hope this