Sound wave represented as a displacement wave travels in positive x – direction & y – axis represents particle’s displacement. Match list I with list II

COLUMN – I		COLUMN – II
A	1	P	Velocity is along +x axis
B	2	Q	Velocity is along – x axis
C	3	R	Velocity is zero
D	4	S	Acceleration is zero

$V_{particle}=-V_{wave}\frac{\partial y}{\partial x}$

At point 1, slope is zero. Therefore, velocity of particle =-slope=0

At point 2, slope is -ve, therefore velocity of particle =-slope=-(-ive)=  +ive. acceleration=0

At point 3, slope is zero, therefore velocity of particle = - slope =0

At point 4, slope is +ive, therefore velocity=-slope=-ive  and acceleration =0