Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 25

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Consider a hypothetical hydrogen-like atom. The wavelength in $\overset{\circ}{A}$ for the spectral lines for the transition from $n = p$ to $n = 1$ are given by, $λ = \frac{1500 p^{2}}{p^{2} - 1}$ , where $p = 2, 3, 4, . . .$ (given $h c = 12400 eV {\overset{\circ}{A}}^{- 1}$ )

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Important Questions on Atomic Physics

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 26

A sample of hydrogen atom gas contains

100

atoms. All the atoms are excited to the same

n^{th}

excited state. The total energy released by all the atoms is

\frac{4800}{49} R c h

( where

R c h = 13.6 eV

),as they come to the ground state through various types of transitions. Find

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 27

One hydrogen atom in its ground state is excited by means of monochromatic radiation of wavelength

975 \overset{\circ}{A}

. You may assume the ionization energy for the hydrogen atom is

13.6 eV

.

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 28

Consider an electron orbiting the nucleus with speed

v

in an orbit of radius

r

. The ratio of the magnetic moment to the orbital angular momentum of the electron is independent of :

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 29

Consider a metal used to produce some characteristic

X -

rays. The energy of

X -

rays is given by

E

and wavelength as represented by

λ

. Then which of the following is true:

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 30

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 31

X-ray falling on a material

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 32

In an x-ray tube the voltage applied is

20 kV

. The energy required to remove an electron from

K

shell is

19.9 KeV

. In the x-rays emitted by the tube

(h c = 12420 eV \overset{\circ}{A})

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 33

In an

X

-ray tube, the accelerating voltage is

20 kV

. Two targets

A

and

B

are used one by one. For

A

the wavelength of the

K_{α}

line is

62 pm

. For

‘ B ’

the wavelength of the

L_{α}

line is

124 pm

. The energy of the

B

ion with vacancy in

M

shell is

5.5 keV

higher than the atom of

B

. [Take

hc = 12400 eV \overset{\circ}{A}

]