What is the frequency of the waves reflected back

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Q.A stationary motion detector sends sound waves of 0.375 MHz toward a truck approaching at a speed of 35.0 m/s. The speed of sound in the air is 343 m/s. What is the frequency of the waves reflected back to the detector?

Q. What mass (in grams) of steam at 100°C must be mixed with 251 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 66.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, and the latent heat of vaporization is 2256 kJ/kg.

Reference no: EM1349003

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