Q.

Displacement (y) of air column of position x from its mean position at any instant is given by graph shown in the figure. We can conclude from graph that

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a

Density of air is minimum at D

b

Average density in pipe is equal to density at point A at given instant

c

Density of air is maximum at B

d

Average density in pipe is equal to density at point C at given instant

answer is A, B, C, D.

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