JEE PHYSICS MCQ: ATOMS

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In an ionisation experiment it is found that a doubly ionised particle enters a magnetic field of 1 T and moves in a circular path of radius 1 m with a speed of

1.6 \times {10^7}\;\mathrm{m}{\mathrm{s}^{ - 1}}

. The particle must be

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Correct option: A

{\mathrm{C}^{ + + }}

Option A (

{\mathrm{C}^{ + + }})

is correct because the mass calculated from the given parameters matches the mass of Carbon-12.

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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