To hear a distinct echo, the time interval between the original sound – McqOptions

MCQOPTIONS

1.	To hear a distinct echo, the time interval between the original sound and reflected sound must be at least ______.
A.	0.1 seconds
B.	0.2 seconds
C.	0.3 seconds
D.	0.4 seconds
Answer» B. 0.2 seconds

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