752Every Day ScienceMedium
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 ________?
ANone of these
B120 ft
C56 ft
D1120 ft
E100 ft
Correct answer
C. 56 ft
Explanation
56 ft is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.