Energy of incident of light to amplitude of light?

AI Thread Summary
The discussion revolves around calculating the ratio of the amplitude of transmitted light to the amplitude of incident light, given that a sheet of glass transmits 70% of the energy of incident light. The relationship between intensity and amplitude is highlighted, stating that intensity is proportional to the square of the amplitude. A participant attempted to calculate the ratio using the formula but arrived at an incorrect answer of 0.49, questioning the squaring of the intensity ratio. The key point is that the correct calculation should consider the square root of the intensity ratio to find the amplitude ratio. Understanding this relationship is crucial for solving the problem accurately.
chewchun
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Homework Statement


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


Homework Equations


Intensity is proportional to amplitude square.



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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chewchun said:
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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