JEE PHYSICS MCQ: ATOMS

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According to Moseley’s law of

X

-rays the frequency

\left( v \right)

of particular characteristic

X

-ray and the atomic number

\left( Z \right)

of the element depend on each other as

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Correct option: D

\sqrt v = kZ

Option D (

\sqrt v = kZ

) is correct because Moseley's law states that the square root of the frequency of characteristic X-rays is proportional to the atomic number of the element.

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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