1.

A person deep inside water cannot hear sound produced in air. Why?

Answer»

As speed of sound in water is roughly four times the speed of sound in air, therefore

μ = \(\frac {sin \,i}{sin\, r}=\frac{v_a}{v_w}\)

= \(\frac{1}{4}\) = 0.25

For refraction,

rmax = 90º

∴ (sin i)max =0.25

∴ imax ≈ 14º . That is why most of sound produced in air and falling at ∠i>14º gets reflected in air and person deep inside water cannot hear the sound.



Discussion

No Comment Found

Related InterviewSolutions