(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :In longitudinal wave pressure is maximum at a point where displacement is zero. Reason: There is a phase difference of π2 between y(x,t) and ΔP(x,t) equation in case longitudinal wave.

The correct option is D Assertion is incorrect but Reason is correctwave pressure can be max or min when displacement is zero depending on the number of particles at a point.equation of wave s=sosin(kx−ωt)and pressure p=pocos(kx−wt)

Assertion :In longitudinal wave pressure is maximum at a point where displacement is zero. Reason: There is a phase difference of $\frac{π}{2}$ between $y (x, t)$ and $Δ P (x, t)$ equation in case longitudinal wave.

The correct option is D Assertion is incorrect but Reason is correct
wave pressure can be max or min when displacement is zero depending on the number of particles at a point.

equation of wave $s = s_{o} s i n (k x - ω t)$
and pressure $p = p_{o} c o s (k x - w t)$