The diagram shows the ground state and two higher-energy states X and Y of an atom.
A transition from X to the ground state produces a photon of wavelength 147 nm.
A transition from Y to the ground state produces a photon of wavelength 160 nm.
What is the energy difference between X and Y?
 
            1 )
1.5 × 10$^{−17}$ J
2 )
1.4 × 10$^{−18}$ J
3 )
1.2 × 10$^{−18}$ J
1.1 × 10$^{−19}$ J
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