Q

For a distinct echo, the interval between the original and reflected sound should be at least approximately:

RRB Group-D; RRB ALP & Technician 26/11/2018 (Shift-III); 13/08/2018 (Shift-III) 2018
✓ Answer: B 0.1 s
The conventional school-level minimum separation for a distinct echo is about 0.1 s.
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