The figure shows an instantaneous displacement position graph of a sound wave travelling along the positive x-axis Identify the points of
i.Maximum pressure,
ii. Minimum pressure and
iii. Atmospheric pressure (or normal pressure.)

Explanation

i. Maximum pressure occure at A because air particles are displaced towards it.
ii. Minimum pressure occurs at C because air particles are displaced away fro it.
iii. Pressure remains atmospheric at B.