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Question
The concentration of photons in a uniform light beam with a wavelength of 500 nm is 1.7 x1013m-3. The intensity of the beam is:
A) 6.8x10-6W/m2
B) 3.2 x102W/m2
C) 1.0 x103W/m2
D) 2.0 x103W/m2
E) 4.0 x103W/m2
Answer
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