How many spectral lines will be observed in emission spectrum of hydrogen
atom if hydrogen atom is exposed with a monochromatic light source for
which energy of photon is 12 eV?
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1
Answer:
Correct option is C)
Energy of the photon, E=
λ
hc
=
97.5
1240
=12.75eV
This energy is equal to energy gap between n=1(−13.6) and n=4(−0.85).
So by this energy, the electron will excite from n=1 to n=4.
When the electron will fall back, numbers of spectral lines emmitted =
2
n(n−1)
=
2
(4)(4−1)
=6
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