Discussion
Which effect does an inversion have on sound propagation?
Answer: D
Sound travels faster in warmer air, so under an inversion the upper part of a wavefront outruns the lower part and the ray bends downward, allowing distant sounds to be heard clearly. This is why traffic noise carries so far on a still cold night. Under a normal lapse rate the refraction is upward and a shadow zone forms beyond a few hundred metres. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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