Determine the intensity (in W/m2) of a harmonic longitudinal wave ...

[fahad]

Determine the intensity (in W/m2) of a harmonic longitudinal wave with a pressure amplitude of 8.0  103 N/m2 propagating down a tube filled with helium. ( = 0.179 kg/m3, v = 972 m/s.)
 a. 3.7  107
  b. 1.8  107
  c. 9.2  108
  d. 4.6  108
  e. 1.5  109

Question 2

The variation in the pressure of helium gas, measured from its equilibrium value, is given by P = 2.9  105 cos (6.20x  3 000t) where x and t have units m and s. Determine the speed (in m/s) of the wave.
 a. 1 515
  b. 153
  c. 484
  d. 828
  e. 101

[dreamfighter72]

Answer to Question 1

b

Answer to Question 2

c