A sonic depth gauge is placed 3.5 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.017 seconds after it was emitted. The air temperature is -20 degrees C. a. How far in m is the surface of the snow from the device? ( round your answer to four significant figures) b. How deep in m is the snow

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A: t = 0.345 sec T = 28.5 C speed of sound = 331 + 0.6T = 331 + 0.6*28.5= 331+17.1=348.1m/s

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