HARD

JEE Main

IMPORTANT

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The $K_{α}$ X-ray of molybdenum has wavelength $0.071 nm$ . If the energy of a molybdenum atom with a $K$ electron knocked out is $27.5 keV$ , the energy of this atom when an $L$ electron is knocked out will be $keV$ . (Round off to the nearest integer ) $[h = 4.14 \times 10^{- 15} eV s, c = 3 \times 10^{8} {m s}^{- 1}]$

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Important Questions on Atoms and Nuclei

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 16 March 2021 Shift 1>Q 21

The first three spectral lines of

H

-atom in the Balmer series are given

λ_{1}, λ_{2}, λ_{3}

considering the Bohr atomic model, the wave lengths of first and third spectral lines

(\frac{λ_{1}}{λ_{3}})

are related by a factor of approximately

x

\times 10^{- 1}

. The value of

x

, to the nearest integer, is ________.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 16 March 2021 Shift 2>Q 22

The half-life of

{Au}^{198}

2.7

days. The activity of

1.50 mg

{Au}^{198}

, if its atomic weight is

198 g {mol}^{- 1}

is,

(N_{A} = 6 \times 10^{23} {mol}^{- 1})

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 16 March 2021 Shift 2>Q 23

Calculate the time interval between

33 %

decay and

67 %

decay if half-life of a substance is

20 \min

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 17 March 2021 Shift 1>Q 24

If an electron is moving in the

n^{th}

orbit of the hydrogen atom, then its velocity

(v_{n})

for the

n^{th}

orbit is given as:

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 17 March 2021 Shift 1>Q 25

Which level of the single ionized carbon has the same energy as the ground state energy of hydrogen atom?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 17 March 2021 Shift 2>Q 26

The atomic hydrogen emits a line spectrum consisting of various series. Which series of hydrogen atomic spectra is lying in the visible region?

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 17 March 2021 Shift 2>Q 27

A particle of mass

m

moves in a circular orbit in a central potential field

U (r) = U_{0} r^{4} .

If Bohr's quantization conditions are applied, radii of possible orbitals

r_{n}

vary with

n^{\frac{1}{α}}

, where

α

is _______ .

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main 18 March 2021 Shift 1>Q 28

Imagine that the electron in a hydrogen atom is replaced by a muon

(μ) .

The mass of muon particle is

207

times that of an electron and charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be:-

The Kα X-ray of molybdenum has wavelength 0.071 nm. If the energy of a molybdenum atom with a K electron knocked out is 27.5 keV, the energy of this atom when an L electron is knocked out will be keV. (Round off to the nearest integer ) h=4.14×10-15 eV s, c=3×108 m s-1

Important Questions on Atoms and Nuclei

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