Energy of a photon

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Show that energy E of a photon having wavelength λ can be written as

E[eV] =1240 [eV ∙ nm] / λ [nm].
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How are you writing on glass? And opposite??!!

Papawork-te
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For the 入589nm what do we need to convert to M or not

minea
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U are teaching and I'm not learning just looking at u

asiyakhatoonansari
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How it came 1.240*10^-9 it is 1.240*10^-6

sanjupradhan