Question

# Three protons coming from excited atomic hydrogen sample are picked up. Their energies are $$12.1\space eV, 10.2\space eV$$ and $$1.9\space eV$$. These photons must come from

A
a single atom
B
two atoms
C
three atoms
D
either two atoms or three atoms

Solution

## The correct option is D either two atoms or three atomsIf the electron jumps from level $$n_3$$ to $$n_1$$ then the photon of energy $$12.1 eV$$ is emitted.If the electron jumps from level $$n_3$$ to $$n_2$$ then the photon of energy $$1.9 eV$$ is emitted.If the electron jumps from level $$n_2$$ to $$n_1$$ then the photon of energy $$10.2 eV$$ is emitted. Clearly these transitions are possible in minimum two atoms or maximum three atoms .Physics

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