Q

A sound wave has frequency 4 kHz and wavelength 40 cm. How long does it take to travel 3.2 km?

RRB ALP & Technician 13/08/2018 (Shift-II) 2018
✓ Answer: C 2 s
v = 4000 × 0.4 = 1600 m/s; t = 3200/1600 = 2 s.
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