What is the minimum distance between the source and the reflecting sur – McqOptions

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1.	What is the minimum distance between the source and the reflecting surface to hear the echo?
A.	लगभग 12 मीटर
B.	लगभग 17 मीटर
C.	लगभग 27 मीटर
D.	लगभग 37मीटर
Answer» C. लगभग 27 मीटर

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