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What is the energy , in joule , associat...

What is the energy , in joule , associated with a photon of wavelength 4000 Å ?

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Energy of a photo ` E = (hc)/(lambda) = (6.6 xx 10^(34) xx 3 xx 10^(8))/(4xx 10^(-7)) = 4 .95 xx 10^(-19) J`
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