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Question

For a hydrogen atom, the energies that an electron can have are given by the expression, E=−13.58/n2eV, where n is an integer. The smallest amount of energy that a hydrogen atom in the ground state can absorb is:

A
1.00eV
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B
3.39eV
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C
6.79eV
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D
10.19eV
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Solution

The correct option is D 10.19eV
The smallest amount of energy that a hydrogen atom in the ground state can absorb is 10.19 eV. It is equal to the energy difference between first and second energy levels.
For a hydrogen atom, the energies that an electron can have are given by the expression, E=13.58/n2eV, where n is an integer.
For first energy level,
E1=13.58/12eV=13.58eV
For second energy level,
E2=13.58/22eV=3.395eV
The difference E2E1=3.395eV(13.58eV)=10.19eV
Hence, the option (D) is the correct answer.

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