Q

A sound wave has frequency 3.5 kHz and wavelength 0.1 m. How long does it take to travel 700 m?

RRB ALP & Technician 30/08/2018 (Shift-III) 2018
✓ Answer: D 2 s
v = 3500 × 0.1 = 350 m/s; t = 700/350 = 2 s.
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