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.

Question

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. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

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.

Q. 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.

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.

Q. A plane wave of sound travelling in air is incident upon a plane
water surface. The angle of incidence is $6 0^{\circ}$ . 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.

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.