Calculate the displacement amplitude (in m) of a 20 kHz sound ...

[jake]

Calculate the displacement amplitude (in m) of a 20 kHz sound wave in helium if it has a pressure amplitude of 8.0  103 N/m2 . ( = 0.179 kg/m3, v = 972 m/s.)
 a. 2.9  1010
  b. 3.7  1010
  c. 7.8  109
  d. 2.4  109
  e. 1.9  1010

Question 2

Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement amplitude is equal to 5.0  108 m. ( = 0.179 kg/m3, v = 972 m/s.)
 a. 3.5  102
  b. 1.6  102
  c. 2.7  102
  d. 4.2  102
  e. 2.0  102

[olderstudent]

Answer to Question 1

b

Answer to Question 2

c

[jake]

Thank you!

[olderstudent]

Always glad to help...