A sound wave of frequency 600Hz falls normally on a perfect reflecting wall. The minimum distance from the wall at which the particles of the medium will have maximum displacement during their vibrations is
[speed of sound =300m/s]
A
78m
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B
38m
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C
18m
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D
58m
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Solution
The correct option is C18m Displacement of particles of the medium near the wall will be zero. So, the minimum distance d between the wall and the particles of the medium having maximum displacement during their vibrations will be λ4 as we can see in the image below.