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A sample of hydrogen (in the form of ato...

A sample of hydrogen (in the form of atoms), is made to absorb white light. `52%` of the hydrogen atoms got ionised. In order to calculate the ionisation energy of hydrogen from its absorption spectrum `("assuming the electrons that got ejected have" KE=0)`, it is possible by measuring the frequency of the:

A

line of shortest wavelength

B

line of longest wavelength

C

line of greatest intensity

D

line of smallest intensity

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