What should be the minimum distance between the source and the reflect – McqOptions

MCQOPTIONS

1.	What should be the minimum distance between the source and the reflector in the air so that the echo can be heard -
A.	10.2 मीटर
B.	12.5 मीटर
C.	15.0 मीटर
D.	17.2 मीटर
Answer» E.

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