When an Electron in a 2p Orbital of a Particular $\times$

Multiple Choice

When an electron in a 2p orbital of a particular atom makes a transition to the 2s orbital,a photon of approximate wavelength 629.1 nm is emitted.The energy difference between these 2p and 2s orbitals is

A) 3.16 $\times$ 10^-28 J
B) 3.16 $\times$ 10^-19 J
C) 3.16 $\times$ 10^-17 J
D) 1.25 $\times$ 10^-31 J
E) none of these