JEE PHYSICS MCQ: ATOMS

1 Medium

1 of 1

Understanding +4 | -1

The wavelength

\lambda

of the

{K_\alpha }

line of characteristic X-rays spectra varies with atomic number approximately

View answer and explanation

Correct option: C

\lambda \propto \frac{1}{{{Z^2}}}

Option C is correct because, according to Moseley's law, the frequency of Kα X-rays is proportional to (Z-1)², and since wavelength is inversely proportional to frequency, wavelength is inversely proportional to Z².

More Questions from ATOMS

Practice All Chapter MCQs →

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