Calculate the Displacement Amplitude (In M)of a 20 KHz Sound $\rho$

Multiple Choice

Calculate the displacement amplitude (in m) of a 20 kHz sound wave in helium if it has a pressure amplitude of 8.0 *10 ^{- 3} N/m².( $\rho$ = 0.179 kg/m³,v = 972 m/s. )

A) 2.9 *10 ^{- 10}
B) 3.7 *10 ^{- 10}
C) 7.8 * 10 ^{- 9}
D) 2.4 *10 ^{- 9}
E) 1.9*10 ^{- 10}