JEE PHYSICS MCQ: ATOMS

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Gases begin to conduct electricity at low pressure because

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Correct option: B

Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionization of atoms

Option B (Colliding electrons can acquire higher kinetic energy due to increased mean free path leading to ionization of atoms) is correct because at low pressure, electrons travel longer distances before colliding, gaining enough energy to ionize atoms.

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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