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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Physics
Chapter: Atomic Physics

NTA Abhyas 2020 · Physics · Atomic Physics

Total number of elements which are present in a row on the periodic...

Total number of elements which are present in a row on the periodic table between those elements, whose wavelength of

{K}_{\alpha}

lines are equal to

250

and

179pm

are (Rydberg constant =

1 . 097 \times {10}^{7}{m}^{- 1}

)

Correct answer

3

Step-by-step solution

Wavelength of

{K}_{\alpha}

line is given by

\lambda = \dfrac{4}{3R{\left(Z - 1\right)}^{2}}

For

\lambda

, between

250

and

179pm

three elements are possible
(

Z = 24

,

25

and

26

).

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