Q

A source of frequency 500 Hz emits waves of wavelength 0.4 m. How long do the waves take to travel 600 m?

RRB Group-D 05/12/2018 (Shift-III) 2018
✓ Answer: C 3 s
v = fλ = 500 × 0.4 = 200 m/s. Hence t = 600/200 = 3 s.
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