An atom absorbs a photon of wavelength 500nm and emits another photon of wavelength 700nm. Find the net energy absorbed by the atom in the process.

Explanation

Here ` lambda_1 = 500 nm = 500 xx 10^(-9)m`,
` lambda_2 = 7000 nm`
` = 7000 xx 10^(-9)m`
`E_1 - E_2 = Energy absorbed by the atom in the process `
`= hc [ 1 / lambda_1 - 1 / lambda_2]`
=` 6.63 xx 3 [1 / 5 - 1 / 7 ] xx 10^(-19)`
`= 6.63 xx 3 xx 2 / 35 xx 10^(-19)`
`= 1.136 xx 10^(-19 ) J `