JEE PHYSICS MCQ: ATOMS

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Assertion (A): In a metal all the free electrons have same energy.

Reason (R): Electrons do not obey Pauli's exclusive principle.

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Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because free electrons in a metal do not have the same energy, and electrons do obey Pauli's exclusion principle.

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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

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\lambda_0

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\lambda_0

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{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