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 x-axis through air. If ${\mathrm{P}}_1, {\mathrm{P}}_2 \mathrm{and} {\mathrm{P}}_3$ represent their pressure amplitudes respectively, then correct relation between them is:

 

• A

  ${\mathrm{P}}_1 > {\mathrm{P}}_2 > {\mathrm{P}}_3$

• B

  ${\text{P}}_3>{\mathrm{P}}_2>{\mathrm{P}}_1$

• C

  ${\mathrm{P}}_1 = {\mathrm{P}}_2 = {\mathrm{P}}_3$

• D

  ${\mathrm{P}}_2>{\mathrm{P}}_2>{\mathrm{P}}_1$