A sоnic depth gаuge is plаced 3.4 m аbоve the grоund. An ultrasound pulse sent downward reflects off snow and reaches the device 0.016 seconds after it was emitted. The air temperature is −25°C. (a). How far (in m) is the surface of the snow from the device? (4.5 points) (b). How deep is the snow? (1.0 point)