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    Pls help! I know that Intensity is directly proportional to Amplitude^2 but I don't understand why the answer here is D

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    (Original post by I-try)
    Pls help! I know that Intensity is directly proportional to Amplitude^2 but I don't understand why the answer here is D

    Intensity directly porportional to square of amplitude:

    I = k*A^2

    If original intensity is I0 and final intensity is I1, then

    I1/I0 = A1^2/A0^2

    If I1 = 3*I0, then (3*I0)/I0= A1^2/A0^2

    => A1^2 = 3*A0^2

    Square root both sides:

    A1 = SQRT(3) * A0

    Does that make sense?
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    Took me a while to get my head around that but wow! Thank you so much!!
 
 
 
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