Question

A sound wave of frequency 660 Hz incidents nor-
mally on a perfectly reflecting object. If the speed
of sound in air is 330 m s-1, what is the shortest
distance from the wall at which the wave parti-
cles have (a) the maximum and (b) the minimum
displacement​

Answer 1

Answer:

Wall denotes the position of formation of node. Displacement at node is zero. The particles will have maximum amplitude of vibration at neighbouring antinode. Antinode is separated from node by a distance of λ/4 = 0.5/4 = 0.125m.

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