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The wavelength of a sound wave travellin...

The wavelength of a sound wave travelling in a solid becomes one third when it propagates through air. If the frequency of the wave remains constant, then find the decreases in the velocity of the wave

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`(i) (V_1)/(V_2) = (lamda_1)/(lamda_2) ,V_1 - V_2`
`(ii) 2//3`
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