Question
Question: Figure shown is a graph, at a certain time t, of the displacement function S(x, t) of three sound wa...
Figure shown is a graph, at a certain time t, of the displacement function S(x, t) of three sound waves 1,2 and 3 as marked on the curves that travel along an x-axis through air. If p1,p2 and p3 represent their pressure amplitudes respectively, then correct relation between them is :

A
P1> P2> P3
B
P3> P2> P1
C
P1 = P2 = P3
D
P2>P3>P1
Answer
P3> P2> P1
Explanation
Solution
P0 = B.k.S0= B(λ2π)S0
⇒ P0 ∝ λ1
Thus pressure amplitude is highest for minimum wavelength, other parameters B and S0 being same for all.