Which has a higher energy, a photon of violet light with wavelength 4000Ã… or a photon of red light with wavelength 7000Ã…? [`h=6.62xx10^(-34)Js`]

Explanation

We know that `E=hv=h.(c)/(lamda)`
Given `h=6.62xx10^(-34)Js,c=3xx10^(8)ms^(-1)`
For a photon of vilet light,
`lamda=4000"Ã…"=4000xx10^(-10)m`
`E=6.62xx10^(-34)xx(3xx10^(8))/(4xx10^(-7))=4.96xx10^(-19)J`
For a photon of red light,
`lamda=7000` Ã… `=7000xx10^(-10)m`
`E=6.62xx10^(-34)xx(3xx10^(8))/(7000xx10^(-10))=2.83xx10^(-19)J`.