Posted by **caleb** on Wednesday, April 21, 2010 at 11:45pm.

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 dont 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 recieve 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

- physics -
**caleb**, Wednesday, April 21, 2010 at 11:57pm
ok figured out intensity need help with other 4

- physics -
**Bob**, Monday, April 28, 2014 at 6:22pm
It emits a sound, so the equation is Intensity = Power / 4(pi)r^2

r being the distance, 158 meters.

## Answer this Question

## Related Questions

- PHYSICS - A concert loudspeaker suspended high off the ground emits 35 W of ...
- Physics - Three sources of sound are distributed along a line, as shown in the ...
- Physics(Please respond) - A source emits sound uniformly in all directions. ...
- PHYSICS - A point source of a wave emits 195 watts. What is the intensity at a ...
- physics - A source of sound (1200 Hz) emits uniformly in all directions. An ...
- physics - A source of sound (1200 Hz) emits uniformly in all directions. An ...
- physics - A source of sound (1200 Hz) emits uniformly in all directions. An ...
- physics - A source of sound (1000 Hz) emits uniformly in all directions. An ...
- Physics - A source of sound (1140Hz) emits uniformly in all directions. An ...
- Physics - A microphone has an area of 6.7 cm2. It receives during a 4.62 s time ...

More Related Questions