The frequency of light emitted,when the electron makes a transition from the level of principal quantum number $n=2$ to the level with $n=1$ is (Take,the ionization energy of hydrogen to be $13.6 \ eV$ and $h \simeq 4 \times 10^{-15} \ eV \cdot s$)
- A$2.55 \times 10^{15} \ Hz$
- B$1.7 \times 10^{15} \ Hz$
- C$3.4 \times 10^{15} \ Hz$
- D$5.1 \times 10^{15} \ Hz$
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