Question

A plane wave of sound travelling in air is incident upon a plane water surface. The angle of incidence is 60∘. If velocity of sound in air and water are 330 m/s and 1400 m/s, then the wave undergoes ​

Answer 1

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Answer 2

Answer:

Given: Angle of incidence in air i=60

o

Some part of the wave will surely get reflected when it strikes the plane surface.

Let also some part of wave will refract and r be the angle of refraction.

Using

sini

sinr

=

v

a

v

w

for refraction from air to water.

sin60

o

sinr

=

330

1400

⟹sinr=3.67 which is >1

As sinθ can never be greater than 1, thus refraction is not possible.

Hence the wave will only reflect.