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A student music box produces a sinusoidal wave with a frequency of 378 Hz. The temperature is 24.96oC, the mean molar mass for air is

A student music box produces a sinusoidal wave with a frequency of 378 Hz. The temperature is 24.96oC, the mean molar mass for air is 28.8x10-3 kg/mol, and the ratio of heat capacities is 1.40. If Student A is at rest and Student B with his loud music box is moving away from Student A at 26.70 m/s. What frequnecy does Student A hear?

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