Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 15

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Earn 100

If the nucleons of a nucleus are well separated from each other total mass increases, From where this mass comes.

Important Questions on Nuclei

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 16

Explain the meaning of nuclear mass defect.

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 17

Assertion: A free neutron is not a stable particle.

Reason: It decays spontaneously into proton, electron and antinutrino.

EASY

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 18

Assertion: The activity of a radioactive sample decreases linearly with time.

Reason: The number of active nuclei present in a radioactive sample decreases exponentially with time.

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 19

Let

T

be the mean life of a radioactive sample.

75 %

of the active nuclei present in the sample initially will decay in time-

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12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 20

A free neutron decays into a proton, an electron and :

EASY

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 21

Write nuclear reaction equations for $α$ -decay of ${}_{88}^{226}R a$ .

HARD

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IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 22

A radioactive isotope has a half-life of

T

years. How long will it take the activity to reduce to

3.125 %

of its original value?

HARD

12th Uttar Pradesh Board

IMPORTANT

Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 13 - Nuclei>Exercise>Q 23

A radioactive isotope has a half-life of

T

years. How long will it take the activity to reduce to

1 %

of its original value?