A sound source of frequency 170 Hz is placed near a wall. A man walkin – McqOptions

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1.	A sound source of frequency 170 Hz is placed near a wall. A man walking from a source towards the wall finds that there is a periodic rise and fall of sound intensity. If the speed of sound in air is 340 m/s the distance (in metres) separating the two adjacent positions of minimum intensity is [MNR 1992; UPSEAT 2000; CPMT 2002]
A.	1/2
B.	1
C.	3/2
D.	2
Answer» C. 3/2

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