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Calculate the energy of 100 photons if t...

Calculate the energy of `100` photons if the wavelength of the light is `2000 Å`.

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The correct Answer is:
`621.1 eV`
Total energy=No of photons xx energy of one photon `=100xx((6.625xx10^(-34)xx3xx10^(8))/(2000xx10^(-10)))`
`=9.937xx10^(-17) J=(9.937xx10^(-17))/(1.6xx10^(-19))eV=621.1 eV`
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