HARD

JEE Main

IMPORTANT

Earn 100

In a hydrogen spectrum $λ$ be the wavelength of first transition line of Lyman series. The wavelength difference will be " $a λ$ " between the wavelength of $3^{rd}$ transition line of Paschen series and that of $2^{nd}$ transition line of Balmer Series where $a =$ _____.

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Important Questions on Atoms and Nuclei

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 26 July 2022 Shift 2>Q 119

Two lighter nuclei combine to form a comparatively heavier nucleus by the relation given below:

${}_{1}^{2}X + {}_{1}^{2}X = {}_{2}^{4}Y$

The binding energies per nucleon ${}_{1}^{2}X$ and ${}_{2}^{4}Y$ are $1.1 MeV$ and $7.6 MeV$ respectively. The energy released in this process is_____ $MeV$ .

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 27 July 2022 Shift 1>Q 120

What is the half-life period of a radioactive material if its activity drops to

\frac{1}{16^{th}}

of its initial value of

30

years ?

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 27 July 2022 Shift 2>Q 121

The activity of a radioactive material is

6.4 \times 10^{- 4}

curie. Its half life is

5

days. The activity will become

5 \times 10^{- 6}

curie after

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 28 July 2022 Shift 1>Q 122

The half life period of a radioactive substance is

60

days. The time taken for

{(\frac{7}{8})}^{t h}

of its original mass to disintegrate will be :

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 28 July 2022 Shift 1>Q 123

A freshly prepared radioactive source of half life

2

hours

30

minutes emits radiation which is

64

times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be _____ hours.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 28 July 2022 Shift 2>Q 124

A radioactive sample decays

\frac{7}{8}

times its original quantity in

15

minutes. The half-life of the sample is

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 29 July 2022 Shift 1>Q 125

Find the ratio of energies of photons produced due to transition of an election of hydrogen atom from its(i) second permitted energy level to the first level, and (ii) the highest permitted energy level to the first permitted level.

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 21 - Atoms and Nuclei>JEE Main - 29 July 2022 Shift 2>Q 126

Two radioactive materials

A

and

B

have decay constants

25 λ

and

16 λ

respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of

B

to that of A will be "

e

" after a time

\frac{1}{a λ}

. The value of

a

is _____ .

In a hydrogen spectrum λ be the wavelength of first transition line of Lyman series. The wavelength difference will be "aλ" between the wavelength of 3rd transition line of Paschen series and that of 2nd transition line of Balmer Series where a= _____.

Important Questions on Atoms and Nuclei

Learn and Prepare for any exam you want !

In a hydrogen spectrum $λ$ be the wavelength of first transition line of Lyman series. The wavelength difference will be " $a λ$ " between the wavelength of $3^{rd}$ transition line of Paschen series and that of $2^{nd}$ transition line of Balmer Series where $a =$ _____.