Calculate the energy of photons of radiation whose wavelength is `5000A^(@)`?

Explanation

`lambda = 5000 A^(0) = 5000 xx 10^(-19) m = 5 xx 10^(-7) m`
`c = 3 xx 10^(8) m // sec, h = 6.62 xx 10^(-34) Js`
`E = (hc)/(lambda) = (6.62 xx 10^(-34) xx 3 xx 10^(8))/(5 xx 10^(-7))`
`3.97 xx 10^(-19) J`