1.when a sound from a source is refracted away from the surface of the earth,it gives an indication that the —– A.air is cooler than the ground B. wind is blowing in the direction of the sound C.air has high humidity D. ground is cooling faster than the air 2.in which one of the following locations can a person hear the echo of a sound ? A. less than 16.6 meters in front of the reflecting surface B.at least 33.2meters behind the reflecting C.at least 16.6 meters in front of the reflecting surface D.less than 33.2 meters behind the reflecting surface
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