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Number of photons of light with a wave l...

Number of photons of light with a wave length of 4000 pm necessary to provide one joule of energy approximately x `xx 10^(16)` . Then r is ______

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The correct Answer is:
2
`E = n (hc)/(lambda) , (nxx 6.625 xx 10^(-34) xx 3 xx 10^8)/(4 xx 10^(-9))`
`implies n = 2 xx 10^(16)`
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