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Suppose an electron is attracted towards the origin by a force $\frac{k}{r}$ where $k$ is a constant and $r$ is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the $n^{t h}$ orbital of the electron is found to be $r_{n}$ and the kinetic energy of the electron to be $T_{n}$ . Then which of the following is true?

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Important Questions on Atomic Physics

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 19

The transition from the state

n = 4 to n = 3

in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from:

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 20

Energy required for the electron excitation in

{Li}^{+ +}

from the first to the third Bohr orbit is :

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 21

Hydrogen atom is excited from ground state to another state with principal quantum number equal to

4 .

Then the number of spectral lines in the emission spectra will be :

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 22

A diatomic molecule is made of two masses

m_{1}

and

m_{2}

which are separated by a distance

r

. If we calculate its rotational energy by applying Bohr’s rule of angular momentum quantization, its energy will be given by : (

n

is an integer)

(h = \frac{h}{2 π})

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 23

In a hydrogen-like atom, electron makes the transition from an energy level with a quantum number

n

to another with quantum number

(n - 1) .

n > > 1

, the frequency of radiation emitted is proportional to :

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 24

Hydrogen

(^{1} H_{1}),

Deuterium

(^{1} H_{2}),

singly ionised Helium

(_{2} {He}^{4})^{+}

and doubly ionised lithium

(_{3} {Li}^{6})^{+ +}

all have one electron around the nucleus. Consider an electron transition from

n = 2 to n = 1 .

If the wavelengths of emitted radiation are

λ_{1}, λ_{2}, λ_{3}, and λ_{4}

respectively then approximately which one of the following is correct?

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 25

As an electron makes a transition from an excited state to the ground state of a hydrogen - like atom/ion:

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 3>Q 26

Some energy levels of a molecule are shown in the figure. The ratio of the wavelengths $r = \frac{λ_{1}}{λ_{2}},$ is given by :

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Important Questions on Atomic Physics

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