A sound wave has a frequency of 4 kHz and a wavelength of 40 cm.

| A sound wave has a frequency of 4 kHz and a wavelength of 40 cm. The time taken by the sound wave to travel a distance of 3.2 km is:

A. 0.5 s

B. 4.0 s

C. 2.0 s

D. 1.0 s

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Any point on the sound wave covers a distance equal to λ (wavelength) in time T (time period).
Velocity of sound = (Wavelength × Frequency) = [(4 × 10³⁾ × (40 ×10^-2)] =1600 m/s
Time = Distance/Velocity = (3.2 × 10³/ 1600) = 2.0 Second