Author Question: Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement ... (Read 21 times)

maegan_martin · **on:** Jul 28, 2018

Calculate the pressure amplitude (in N/m2) of a 500 Hz sound wave in helium if the displacement amplitude is equal to 5.0 10-8 m. (r = 0.179 kg/m3, v = 972 m/s.)
a. 3.5 10-2
b. 1.6 10-2
c. 2.7 10-2
d. 4.2 10-2
e. 2.0 10-2

Question 2

To transmit four times as much energy per unit time along a string, you can
a. double the frequency.
b. double the amplitude. c. increase the tension by a factor of 16.
d. do any one of the above. e. do only (a) or (b) above.