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What , is the number of photons of lig...

What , is the number of photons of ligth with a wavelength of 400 pm that provide 1 j of energy

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Wavelength `(lambda) = 400 pm :. , 1 pm = 10^(12) m`
Energy (E ) = 1 J
If number of photon =N
energy of N photon = `(Nhc )/( lambda ) = E`
`N = (E xx lambda )/( hc )`
`=(11xx 4000 xx 10^(12)m)/( 6.626 xx 10^(34) j s xx 3.0 xx 10^(8) ms^(-1))`
2.012 `xx 10^(16)` number of photon
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