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Energy of incident of light to amplitude of light?

by chewchun
Tags: amplitude, energy, incident, light
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chewchun
#1
Aug19-12, 07:03 AM
P: 24
1. The problem statement, all variables and given/known data
A sheet of glass transmit 70% of the energy of the incident light
What is the value of the quantity: (Amplitude of transmitted light) / (Amplitude of incident light)
A:0.49
B:0.70
C:0.84
D:1.19


2. Relevant equations
Intensity is proportional to amplitude square.



3. The attempt at a solution
I tried relating to the above equation but i got 0.7^2/1^2=0.49 (A) but answer is not A...
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Doc Al
#2
Aug19-12, 07:13 AM
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Quote Quote by chewchun View Post
I tried relating to the above equation but i got 0.7^2/1^2=0.49 (A) but answer is not A...
Why did you square the ratio of intensities?


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