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 . (r = 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
B
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