Q

To hear a distinct echo, what minimum distance should separate the source and obstacle under the assumed conditions?

RRB Group-D 20/09/2018 (Shift-III) 2018
✓ Answer: B 17.2 m
At 344 m/s and a 0.1 s minimum delay, d = 344 × 0.1/2 = 17.2 m.
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