The frequency of a sound wave is 50 Hz and its wavelength is 4 m. What is the speed of thesound wave?

Correct option is D

Given,
frequency = 50 Hz,
wavelength = 4 m.
As we knwo, the velocity of wave = Frequency Wavelength
= 50 x 4
= 200 m/s.
Therefore, the distance travelled by the sound wave in 3 s 200 x 3 = 600 m.