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  4. A plane wave of sound travelling in air is incident upon a plane water surface. The angle of incidence is 60°. Assuming Snell's law to be valid for sound waves, it follows that the sound wave will be refracted into water away from the normal.

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Q. A plane wave of sound travelling in air is incident upon a plane
water surface. The angle of incidence is $60^\circ$. Assuming Snell's
law to be valid for sound waves, it follows that the sound wave
will be refracted into water away from the normal.

IIT JEEIIT JEE 1984Waves

Solution:

For sound wave water is rarer medium because speed of
sound wave in water is more. When a wave travels from a
denser medium to rarer medium it refracts away from the
normal.

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