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The retina of a human eve can detect light when radiant energy incident on it is at least 4.001017J, For light of 645 nm waveiength,

The retina of a human eve can detect light when radiant energy incident on it is at least 4.001017J, For light of 645 nm waveiength, how many photons does this correspond to? Be sure your answer has the correct number of significant digits. photons

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