Recent content by Aleisha

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    Calculation for finding distance with regard to sound intensity

    Yes yes! Thank you I get the correlation now :)
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    Calculation for finding distance with regard to sound intensity

    I=P/A If the area is four times bigger then the intensity (energy density) then the intensity with decrease by 4 times, correct?
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    Calculation for finding distance with regard to sound intensity

    It must be the area according to the equation A=4 x Pi x r^2
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    Calculation for finding distance with regard to sound intensity

    Ah ha! It’s 4 times bigger!
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    Calculation for finding distance with regard to sound intensity

    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
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    Calculation for finding distance with regard to sound intensity

    Twice as large
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    Calculation for finding distance with regard to sound intensity

    Ohhh the area is 1/4 of the original amplifier?
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    Calculation for finding distance with regard to sound intensity

    The power density will increase by a factor of 4, if the radius is doubled?
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    Calculation for finding distance with regard to sound intensity

    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?
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    Calculation for finding distance with regard to sound intensity

    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...
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    Calculating the power output from a persons mouth

    Am i assuming that the particles are moving at a velocity of v=343m/s?
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    Calculating the power output from a persons mouth

    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...
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    Specific heat capacity of a solid material

    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 :)
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    Specific heat capacity of a solid material

    Yes that’s understandable thank you :)
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    Specific heat capacity of a solid material

    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?