JEE PHYSICS MCQ: ATOMS

1 Medium

1 of 1

Analyzing +4 | -1

An X-ray tube with a copper target is found to be emitting lines other than those due to copper. The

K_\alpha

line of copper is known to have a wavelength

1.5405 \mathop {\text{A}}\limits^ \circ

and the other two

K_\alpha

lines observed have wavelengths

0.7090 \mathop {\text{A}}\limits^ \circ

and

1.6578 \mathop {\text{A}}\limits^ \circ

. Identify the impurities.

View answer and explanation

Correct option: C

Both (1) and (2)

Option C is correct because the impurities identified using Moseley's law are Molybdenum and Nickel, based on the given wavelengths of the emitted X-ray lines.

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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