Calculate the number of photons, from green light of mercury (ʎ = 4961 Å), required to do one joule of work.

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1.	Calculate the number of photons, from green light of mercury (ʎ = 4961 Å), required to do one joule of work.
A.	4524.2×1018/m3
B.	2.4961×1018/m3
C.	2.4961/m3
D.	2.4961/m
Answer» C. 2.4961/m3

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