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Question
The intensity of a light beam with a wavelength of 500 nm is 2000 W/m2. The photon flux is about:
A) 5 x1017/m2.s
B) 5 x1019/m2.s
C) 5 x1021/m2.s
D) 5 x1023/m2.s
E) 5 x1025/m2.s
Answer
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