JEE Main & Advanced
Physics
Atomic Physics
Question Bank
Numerical Value Type Questions - Atoms
question_answer
An excited \[H{{e}^{+}}\] ion emits two photons in succession, with wavelengths 108.5 nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength \[\lambda ,\]energy \[E=\frac{1240eV}{\lambda (in\,\,nm)}\]