JEE PHYSICS MCQ: ATOMS

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Find the wavelengths present in the radiation emitted
when hydrogen atoms excited to

n = 3

states return to
their ground states.

View answer and explanation

Correct option: A

103 nm, 122 nm, 654 nm

Option A (103 nm, 122 nm, 654 nm) is correct because these wavelengths correspond to the transitions from n=3 to n=1, n=3 to n=2, and n=2 to n=1 in the hydrogen atom.

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The de-Broglie wavelength of an electron in the first Bohr orbit is The volume occupied by an atom is greater than the volume of the nucleus by a factor of about For a hydrogen atom, when electron jump from

n

=2

{n}=1

, then wave length of radiation emitted found to be

\lambda_0

. Then, for which transition of electron of a 'He' atom, the wavelength of radiation emitted will be equal to '

\lambda_0

'. Energy of characteristic X-ray is a consequence of Taking Rydberg’s constant

{R_H} = 1.097\,\, \times \,\,{10^7}\,\,m

, first and second wavelength of Balmer series in hydrogen spectrum is When hydrogen atom is in its first excited level, its radius is its ground state radius