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IMPORTANT

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Figure shows the energy levels $P, Q, R, S$ and $G$ of an atom where, $G$ is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from $Q$ to $S$ . A blue line can be obtained by which of the following energy level change?

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Important Questions on Modern Physics

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 22

An electron makes a transition from orbit

n = 4

to the orbit

n = 2

of a hydrogen atom. The wave number of the emitted radiations (

R =

Rydberg's constant ) will be

HARD

JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 23

The wavelength of radiation emitted is

λ_{0}

when an electron jumps from the third to the second orbit of a hydrogen atom. For the electron jump from the fourth to the second orbit, the wavelength of radiation emitted will be,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 24

When an electron in a hydrogen atom is excited from its fourth to fifth stationary orbit, the change in angular momentum of electron is (take, Planck's constant,

h = 6.6 \times 10^{- 34} J s

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JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 25

The concept of stationary orbits was proposed by,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 26

The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is,

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 27

The ionisation potential of

H

-atom is

13.6 V

. When it is excited from ground state by monochromatic radiations of

970.6 \overset{\circ}{A}

, the number of emission lines will be (according to Bohr's theory),

MEDIUM

JEE Advanced

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 28

The excitation energy of a hydrogen like ion in its first excitation state is

40.8 eV

. The energy needed to remove the electron from the ion in ground state is,

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JEE Advanced

IMPORTANT

Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 9 - Modern Physics>Objective Problems [Level 1]>Q 29

In Bohr's model, the atomic radius of the first orbit is

r_{0}

. Then, the radius of the third orbit is,

Figure shows the energy levels P, Q, R, S and G of an atom where, G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by which of the following energy level change?

Important Questions on Modern Physics

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Figure shows the energy levels $P, Q, R, S$ and $G$ of an atom where, $G$ is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from $Q$ to $S$ . A blue line can be obtained by which of the following energy level change?