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

Right Answer:  56 ft

February 19, 2018   Asghar Khan    Everyday Science  
Total 1 Votes:
1

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