A tiny speaker emits sound with a frequency of 1000Hz evenly on all sides. On
a distance of 1m from the loudspeaker is an amplitude variation of the particles of air 0.005 μm. On what distance we can barely hear the sound, if the limit of the audible strength or intensity is 10^-12 W/m2? The speed of sound is 340m/s, air density is 1.2 kg/m3. What is the sound power of the loudspeaker at a distance of 1m?
The Attempt at a Solution
For the second part: What is the sound power of the loudspeaker at a distance of 1m?
I= P/ 4πr² → P= 4πr²*I
P= 1.256 x 10^-11 W
Can someone please give me a hint for the first part?
Thank you for helping!