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An electron, a doubly ionized helium ion $({He}^{+ +})$ and proton are having the same kinetic energy. The relation between their respective de-Broglie wavelength $λ_{e}, λ_{{He}^{+ +}}$ and $λ_{p}$ is :

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Important Questions on Atoms and Nuclei

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JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 6 September 2020 Shift 1>Q 48

You are given that Mass of

{}_{3}^{7}{Li} = 7.0160 u,

Mass of

{}_{2}^{4}{He} = 4.0026 u

and Mass of

{}_{1}^{1}{He} = 1.0079 u

. When

20 g

{}_{3}^{7}{Li}

is converted into

_{2}^{4} He

by proton capture, the energy liberated, (in

kWh

), is: [Mass of nucleon

= 1 GeV / c^{2}

]

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 7th January 2020 Shift 1>Q 49

The time period of revolution of electron in its ground state orbit in a hydrogen atom is

1.6 \times 10^{- 16} s .

The frequency of revolution of the electron in its first excited state (in

s^{- 1}

) is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 7th January 2020 Shift 2>Q 50

The activity of a radioactive sample falls from

700 s^{- 1}

500 s^{- 1}

30

minutes. Its half life is close to:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 8th January 2020 Shift 1>Q 51

The graph which depicts the results of Rutherford gold foil experiment with

α

-particles is:

θ :

Scattering angle

Y :

Number of scattered

α

-particles detected
(Plots are schematic and not to scale)

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 8th January 2020 Shift 2>Q 52

The first member of the Balmer series of hydrogen atom has a wavelength of

6561 \overset{\circ}{A}

. The wavelength of the second member of the Balmer series (in nm) is_____________

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 9th January 2020 Shift 2>Q 53

The energy required to ionise a hydrogen like ion in its ground state is

9

Rydbergs. What is the wavelength of the radiation emitted when the electron in this ion jumps from the second excited state to the ground state?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 9th April 2019 Shift 1>Q 54

Taking the wavelength of first Balmer line in hydrogen spectrum

(n = 3

n = 2)

660 n m

, the wavelength of the

2^{n d}

Balmer line

(n = 4

n = 2)

will be :

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 9th April 2019 Shift 2>Q 55

H e^{+}

ion is in its first excited state. Its ionization energy is:

An electron, a doubly ionized helium ion He++ and proton are having the same kinetic energy. The relation between their respective de-Broglie wavelength λe, λHe++ and λp is :

Important Questions on Atoms and Nuclei

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An electron, a doubly ionized helium ion $({He}^{+ +})$ and proton are having the same kinetic energy. The relation between their respective de-Broglie wavelength $λ_{e}, λ_{{He}^{+ +}}$ and $λ_{p}$ is :