The echo (reflected sounD will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________
(A) 1120 ft
(B) 120 ft
(C) 56 ft
(D) 100 ft
(E) None of these
The echo (reflected sounD will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ________
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