Recent content by Aleisha

Yes yes! Thank you I get the correlation now :)

I=P/A If the area is four times bigger then the intensity (energy density) then the intensity with decrease by 4 times, correct?

It must be the area according to the equation A=4 x Pi x r^2

Ah ha! It’s 4 times bigger!

It must be half then? That’s what I thought I meant because if 1/4 because the radius its r squared not just r... I’m getting too confused haha

Twice as large

Ohhh the area is 1/4 of the original amplifier?

The power density will increase by a factor of 4, if the radius is doubled?

Right ofcourse I didn’t realize I was looking for radius. Don’t i need to know the area to get the radius? Or could I equate the two equations together?

Homework Statement Two amplifiers can be used to power a sound system. Amplifier 1: Has a fixed power output of 300 W. Amplifier 2: Has a variable power output of between 15 W and 175 W. You may assume that the power output of the amplifier is equal to the power of the sound waves that are...

Am i assuming that the particles are moving at a velocity of v=343m/s?

Homework Statement Speech at a distance of 45.1 cm has a sound level of 59.3 dB. Assuming that the energy in the sound spreads out equally in all directions from the person's mouth, calculate the total power output from the person. Given: Distance= 0.451m Sound level 59.3 dB P=? J Homework...

I got an overall answer of 310 J/kg/K and the answer was correct. All the data was copy and pasted from my question. Thank you for your help :)

Yes that’s understandable thank you :)

Thank you very much! So I should just find 38.3% of my answer (809.27)? Is that correct because it’s only being 30% efficient in its absorbance?