What is the difference in energy between ` 1s` and `2p`-orbitals in the hydorgen atom ? In the X-ray spectrum of Cu , radiation of ` 1.54 Å ` wavelength is emitted when an electron charges form ` 2p` to 1s-orbital . What is the energy difference between these orbitals in copper ?

Explanation

`1.635 xx 10^(-11)` erg , `1.29 xx 10^(15) J,`