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WASSCE
The table below shows the energy distribution for various levels of an atom. Use it to answer this question.
| Energy level (n) | 1 | 2 | 3 | 4 |
| Energy (eV) | -13.6 | -3.39 | -1.51 | -0.85 |
[h = 6.6 × 10-34 Js, e = 1.6 × 10-19C; c = 3.0 × 108 ms-1]
If the atom de-excites from n = 2, wavelength of the emitted radiation is
A.
2.4 × 10-7m
B.
1.2 × 10-7m
C.
2.4 × 10-9m
D.
1.2 × 10-9m
Answer: B
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