Question

Example 3 A source of sound operates at 2.0 kHz, 20 W
emitting sound uniformly in all directions. The speed of
sound in air is 340 m/s and the density of air is 1.2 kg/m”.
(a) What is the intensity at a distance of 6.0 m from the
source? (b) What will be the pressure amplitude at the point?
(c) What will be the displacement amplitude at this point?​

Answer 1

Answer:

I DON'T KNOW THE ANSWER

Answer 2

Answer:

intensity would be energy per unit area per unit time so

I=power/area

I=20/4π36 wt/m^2

(c) freq and velocity of sound would not vary, so

d amplitude=vel/frq=340/2000 m