MCQ
Ritz combination principle is :
- ✓${\nu ^ - } = {R_H}({z^2})\left[ {\left. {\frac{1}{{{n^2}_1}} - \frac{1}{{{n_2}^2}}} \right]} \right.$
- B${E_n} = \frac{{ - 2{\prod ^2}m{z^2}{e^4}}}{{{h^2}}}$
- C$E = \frac{{hc}}{\lambda }$
- Dnone
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