Question

Displacement (y) of air column at position x from its mean position at any instant is given by graph shown in figure. Then :

• A. Density of air is maximum at B
• B. Density of air is minimum at D
• C. Density is maximum at D
• D. Density is minimum at A

Answer 1

Answer: (A), (B)

The correct options are
A Density of air is maximum at B
B Density of air is minimum at D

Sound wave propagates as a series of compression and rarefaction. The dotted line shows the
air density. Thus we can say that at B, density is maximum and at D, density is minimum.