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How many photons having wavelength 4557 ...

How many photons having wavelength `4557 Å` are needed to provide 1 Joule of energy ?

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Energy, `E =(nhc)/(lamda)" or "n=(E lamda)/(hc) =(1Jxx4557xx10^(-10) m)/(6.626xx10^(-34) J s xx3.0xx10^(8) ms^(-1))=2.292 xx10^(-18)` photons
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