JEE PHYSICS MCQ: ATOMS

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Assertion: When light is passed through a sample of hydrogen atoms in ground state, then wavelengths of absorption lines are same as wavelengths of lines of Lyman series in emission spectrum. and

Reason : In ground state hydrogen atom will absorb only those radiation which will excite to higher energy level.

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Correct option: A

Assertion is true, Reason is true and Reason is correct explanation for Assertion.

Option A is correct because both the assertion and the reason are true, and the reason correctly explains why absorption lines match Lyman series emission lines.

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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