Consider three energy levels of an electron which are labeled 1,2 and 3 in order of increasing energy. The difference in energy levels between 1 and 2 is twice as much as the energy difference between levels 2 and 3. A photon of wavelength is emitted when the electrons jumps from level 3 to level 2. What wavelength photons are emitted when the other possible transitions occur?

2 only

/2, 3

2, 3

/2 only

/2, /3

2, /3