An electronic point source emits sound isotropically at a frequency of 3000 Hz and a power of 34 watts. A small microphone has an area of 0.75 cm2 and is located 158 meters from the point source. a) What is the sound intensity at the microphone ?
To find intensity i tried I=Power/Area which is 34/.0075m but its saying my answer is wrong help??
and i don't know how to get others
I = ? W/m2
b) What is the power intercepted by the microphone?
Pin = ? W
c) How many minutes will it take for the microphone to receive 0.3 Joules from this sound?
ΔT = ? min
d) What is the sound intensity level at the microphone from this point source?
Β = ? dB
e) What would be the sound intensity level at the microphone if the point source doubled its power output?
Β = ? dB
2 answers
ok figured out intensity need help with other 4
It emits a sound, so the equation is Intensity = Power / 4(pi)r^2
r being the distance, 158 meters.
r being the distance, 158 meters.
1 answer