First slide

Hydrogen -like ion

Question

An electron revolve round the nucleus of a hydrogen like atom of atomic no 4. In order to excite the electron from state n=2 to n=3 the energy required is

Easy

A

47.2 eV
B

30.2 eV
C

17 eV
D

13.6 eV

Solution

Energy of H atom = $13 .6 (\frac{1}{4} - \frac{1}{9}) 16 = energy required$

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