Answer:
The speed of sound in water is nearly four times the speed of sound in air. From Snell?s law of refraction, \[\mu =\frac{\sin i}{\sin r}=\frac{{{\upsilon }_{a}}}{{{\upsilon }_{w}}}=\frac{1}{4}=0.25\] For refraction, \[{{r}_{\max }}={{90}^{\circ }},\] so \[{{(\sin i)}_{\max }}=0.25.\] Hence \[{{i}_{\max }}={{14}^{\circ }}\]. Consequently, most of the sound produced in air and incident at \[\angle i>14{}^\circ \] gets reflected back in air and very small amount is refracted into water. Hence a person deep inside water cannot hear the sound produced in air.
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