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Q.

From a hydrogen discharge tube, only three photons are picked up. The energies of these three photons were 10.2, 12.1 and 1.9eV then find the minimum number of hydrogen atoms needed to observe these three given photons

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answer is 2.

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Detailed Solution

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At least two atoms are needed for these three transitions 

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From a hydrogen discharge tube, only three photons are picked up. The energies of these three photons were 10.2, 12.1 and 1.9eV then find the minimum number of hydrogen atoms needed to observe these three given photons