what should be the minimum distance between source and reflector in water so that echo is heard distinctly (The speed of sound in water = 1400m s^-1)

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Solution

Dear student

as it is given in the question that the speed of sound in water is 1400m/s
we know that according to the persistance of hearing the sensation of sound lasts for 1/10s
so the time taken will be 0.1s
now, 2d = v $\times$ t
2d = 1400 $\times$ 0.1
2d = 140
d = $\frac{140}{2}$ = 70m.
so the minimum distance between the source and the reflector will be 70m
Regards

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what should be the minimum distance between source and reflector in water so that echo is heard distinctly (The speed of sound in water = 1400m s-1)

what should be the minimum distance between source and reflector in water so that echo is heard distinctly (The speed of sound in water = 1400m s^-1)