A sound wave having frequency of 300 Hz is travelling in an unknown medium. Its wavelength is not known. It travels a distance equal to 150 times its wavelength in time t. The value of t is:
Using the relationship of wave speed v = frequency (f) x wavelength (λ), the distance travelled in time t is v x t = 150 x λ. Solving this with f = 300 Hz gives t = 1 s.