Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 76

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Calculate the shortest wavelength of Lyman series. Given Rydberg constant, $R = 10967700 m^{- 1}$ .

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Important Questions on Atoms

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 77

A photon was absorbed by a hydrogen atom in its ground state and the electron was promoted to the fifth orbit. When the excited atom is returned to its ground state, visible and other quanta were emitted. In this process, how many maximum spectral lines could be obtained?

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 78

The energy levels of the hydrogen spectrum is shown in the figure. There are some transitions $A$ , $B$ , $C$ , $D$ and $E$ . Transition $A$ , $B$ and $C$ respectively represent

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 79

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

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 80

A monochromatic radiation excites Hydrogen atoms in the ground state by of photon energy

12.1 eV

. How many spectral lines emitted by hydrogen atoms according to Bohr's theory ?

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 81

A particle

A

of mass

m

and charge

q

is accelerated by a potential difference of

50 V .

Another particle

B

of mass

4 m

and charge

q

is accelerated by a potential difference of

2500 V .

The ratio of de-Broglie wavelengths

\frac{λ_{A}}{λ_{B}}

is close to:

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 82

The de Broglie wavelength of an electron in the first Bohr orbit of hydrogen atom is

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 83

An electron orbiting a proton in the

n = 2

state of hydrogen has speed

v

. The electron is put in the

n = 3

state of hydrogen. What is the speed of the electron in the new orbit?

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Achieve CUET (UG) Physics Practice Book>Chapter 12 - Atoms>Exercise>Q 84

An electron is moving on a circular path around a stationary neutron under gravitation interaction. The mass of the neutron and electron are

M

and

m

respectively. If Bohr’s quantum condition holds here, the minimum permissible de Broglie wavelength associated with the electron will be_____.