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IMPORTANT

Earn 100

The figure shows the variation of frequency of a characteristic $x -$ ray and atomic number.

$(i)$ Name the characteristic $x -$ ray.

$(ii)$ Find the energy of the photon emitted when this $x -$ ray is emitted by a metal having $z = 101 .$

Important Questions on Atomic Physics

EASY

JEE Main/Advance

IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 20

Find the wavelength of the

K_{α}

line in copper

(Z = 29),

if the wave length of the

K_{α}

line in iron

(Z = 26)

is known to be equal to

193 pm .

(Take b = 1)

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 21

A hydrogen like atom (atomic number

Z

) is in a higher excited state of quantum number

n .

This excited atom can make a transition to the first excited state by successively emitting two photons of energies

10.20 eV and 17.00 eV

, respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energies

4.25 eV and 5.95 eV

, respectively. Determine the values of

n and Z .

(Ionization energy of hydrogen

atom = 13.6 eV

)

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 22

Characteristic X-rays of frequency

4.2 \times 10^{18} Hz

are emitted from a metal due to transition from L- to K-shell. Find the atomic number of the metal using Moseley’s law. Take Rydberg's constant

R = 1.1 \times 10^{7} m^{- 1} .

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 24

a_{0}

is the Bohr radius, the radius of the

n = 2

electronic orbit in triply ionized Beryllium is -

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 25

Consider

2 hydrogen

like ions

A and B .

Ionization energy of

A

is greater than that of

B . Let r, u, E and L

represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state:

EASY

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 26

Which energy state of doubly ionized lithium

({Li}^{+ +})

has the same energy as that of the ground state of hydrogen ? Given

Z

for

lithium = 3 :

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 27

In Bohr’s model of hydrogen atom, the centripetal force is provided by the Coulomb attraction between the proton and the electron. If

a_{0}

is the radius of the ground state orbit, m is the mass and e the charge of an electron and

ε_{0}

is the vacuum permittivity, the speed of the electron is :

EASY

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IMPORTANT

Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 28

If an orbital electron of the hydrogen atom jumps from the ground state to a higher energy state, its orbital speed reduces to half its initial value. If the radius of the electron orbit in the ground state is

r,

then the radius of the new orbit would be :

The figure shows the variation of frequency of a characteristic x-ray and atomic number. (i) Name the characteristic x-ray. (ii) Find the energy of the photon emitted when this x-ray is emitted by a metal having z= 101.

Important Questions on Atomic Physics

Learn and Prepare for any exam you want !

The figure shows the variation of frequency of a characteristic $x -$ ray and atomic number.

$(i)$ Name the characteristic $x -$ ray.

$(ii)$ Find the energy of the photon emitted when this $x -$ ray is emitted by a metal having $z = 101 .$