The speed of a sound wave is 344 m/sec in air and 1320 m/sec in water. a) Which medium has the higher “index of refraction” for sound? B) What is the critical angle for a sound wave incident on the surface between air and water? c) for total internal reflection to occur must the sound wave be traviling in the air oor in the water ? d) use ypur result to explain why its possible to hear people on the opposite shore of river or small lake to clear ?