A source emits sound waves isotropically. The intensity of the waves 2.50 m from the source is 1.91 x 10^-4 W/m^2. Assuming the energy waves are conserved, the power of the source is?

Question

anonymous · Answer

well I havent done in this in more than a year.

but from the units it looks like the formula for intensity = Power / Area  ( and I dont think there is a proportionality constant lying around ).

anonymous · Answer

pellet

anonymous · Answer

I put volume instead of area lol

anonymous · Answer

The area of a sphere is $$4 \pi r^{2}$$so the power is $$IA=I \times4 \pi r^{2}$$

anonymous · Answer

thats why someone is replying

anonymous · Answer

$$P = 4(1.91 \times 10^{-4} ) (2.5^2)\pi $$

anonymous · Answer

i used area of circle instead of sphere, thanks for correcting me!!