Difficult
$A$ plane wave of sound traveling in air is incident upon a plane surface of a liquid. The angle of incidence is $60^{\circ}$. The speed of sound in air is $300 \ m/s$ and in the liquid it is $600 \ m/s$. Assume Snell's law to be valid for sound waves.
- AThe wave will refract into liquid away from normal.
- BThe wave will refract into liquid towards the normal.
- CThe wave will reflect back into air.
- DNone of these.
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