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A sound source of frequency 170 Hz is pl...

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

A

`1//2`

B

1

C

`3//2`

D

2

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The correct Answer is:
B
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