Which of the following statement is correct?

The rest mass of the stable nucleus is less than the sum of the rest masses of its separated nucleons

The rest mass of the stable nucleus is greater than the sum of the rest masses of its separated nucleons

In nuclear fission, energy is released by fusion is of two nuclei of medium mass (approximate 100 amu )

Which among the following statements is not true?

Madam curie discovered natural radio activity

Solar power may be future source of power for cars

Development in medicine may increase average life expectancy

X -rays were discovered by Roentgen

Which of the following nuclear reactions is possible?

Np 93 239 ⟶ Pu 94 239 + β - + ν ¯

B 5 10 + He 2 4 ⟶ N 7 13 + H 1 1

Na 11 24 + H 1 1 ⟶ Ne 10 20 + He 2 4

N 7 11 + H 1 1 ⟶ C 6 12 + β - + ν ¯

E M B I B E

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 9

MEDIUM

NEET

IMPORTANT

Earn 100

A radioactive material decays by simultaneous emissions of two particles with half lives of $1400$ years and $700$ years, respectively. What will be the time after the which one third of the material remains ? (Take $\ln 3 = 1.1$ )

50% studentsanswered this correctly

Important Questions on Atoms and Nuclei

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 10

The half-life of

{}^{198}{Au}

is

3

days. If atomic weight of

{}^{198}{Au}

is

198 g {mol}^{- 1}

, then the activity of

2 mg

of

{}^{198}{Au}

is [in

disintegration {second}^{- 1}

]:

HARD

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 11

At time

t = 0

, a material is composed of two radioactive atoms

A

and

B

, where

N_{A} (0) = 2 N_{B} (0)

. The decay constant of both kind of radioactive atoms is

λ

. However,

A

disintegrates to

B

and

B

disintegrates to

C

. Which of the following figures represents the evolution of

\frac{N_{B} (t)}{N_{B} (0)}

with respect to time

t

?

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 12

Two identical samples (same material and same amount)

P

and

Q

of a radioactive substance having mean life

T

are observed to have activities

A_{P}

and

A_{Q}

, respectively at the time of observation. If

P

is older than

Q

, then the difference in their age is

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 13

The half-life of radioactive Polonium (

Po

) is

138.6 days

. For ten lakh Polonium atoms, the number of disintegrations in

24 h

is____ (Take

{(\frac{1}{2})}^{\frac{1}{138.6}} = 0.995

)

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 14

The remaining quantity (in

%

) of the radioactive element after

5

half-lives is

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 15

A

β

-particle is emitted by a radioactive nucleus at the time of conversion of a

MEDIUM

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 16

Electron-positron pair can be created by

γ -

rays. In this process the minimum energy of

γ -

rays should be ( mass of electron,

m_{e} = 9.1 \times 10^{- 31} kg

)

EASY

NEET

IMPORTANT

Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 2>Q 17

M_{n}

and

M_{p}

represent mass of neutron and proton, respectively. If an element having atomic mass

M

has

N

-neutrons and

Z

-protons, then the correct relation will be,

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A radioactive material decays by simultaneous emissions of two particles with half lives of 1400 years and 700 years, respectively. What will be the time after the which one third of the material remains ? (Take ln3=1.1)

Important Questions on Atoms and Nuclei

Learn and Prepare for any exam you want !

A radioactive material decays by simultaneous emissions of two particles with half lives of $1400$ years and $700$ years, respectively. What will be the time after the which one third of the material remains ? (Take $\ln 3 = 1.1$ )