State whether the following is true or false, giving reason: \"A plane wave of sound travelling in air is incident upon a plane water surface at 6 0 ∘ . Assuming Snell\'s law to be valid for soun

Question

State whether the following is true or false, giving reason: \"A plane wave of sound travelling in air is incident upon a plane water surface at 6 0 ∘ . Assuming Snell\'s law to be valid for sound, the sound wave will be refracted into water away from the normal.\"

TestHub · Accepted Answer

sin r = sin 6 0 ∘ × v w ​ / v a ​ = 0.866 × 1480/340 = 3.8 > 1 , which is impossible. The critical angle for air to water is sin − 1 ( 340/1480 ) = 13.3 ∘ , so at 6 0 ∘ the sound is totally reflected and there is no refracted wave.

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