GATE PH concept:beta-decay PYQs & Answers

Questions 1–6 of 6. Imported answers require independent review unless marked reviewed.

Which of the following consideration(s) is/are shown that nuclear beta decay,

, has to be a three-body decay?

Your answerSelect all correct options. You can choose more than one.

Continuous distribution of the electron energy

Spin of the final state

Mass of the electron

Mass of the proton

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Consider two hypothetical nuclei

and

undergoing

decay, resulting in nuclei

and

, respectively. The decay scheme and the corresponding

values of the nuclei are given in the figure. Which of the following option(s) is/are correct? (

is the total angular momentum and

is parity)

Your answerSelect all correct options. You can choose more than one.

is Fermi transition and

is Fermi transition

is Fermi transition and

is Gamow-Teller transition

is Gamow-Teller transition and

is Fermi transition

is Gamow-Teller transition and

is Gamow-Teller transition

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Let

and

, respectively, denote number and kinetic energy of electrons produced in a nuclear beta decay. Which one of the following distributions is correct?

Your answerChoose one option.

Diagram for Physics question 19 (figure 2)

Diagram for Physics question 19 (figure 3)

Diagram for Physics question 19 (figure 4)

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Match the order of

-decays given in the left column to appropriate clause in the right column. Here

and

are nuclei with intrinsic spin

and parity

. 1.

; 2.

; 3.

; 4.

. i) First forbidden

-decay; ii) Second forbidden

-decay; iii) Third forbidden

-decay; iv) Allowed

-decay.

Your answerChoose one option.

1 – i, 2 – ii, 3 – iii, 4 – iv

1 – iv, 2 – i, 3 – ii, 4 – iii

1 – i, 2 – iii, 3 – i, 4 – iv

1 – iv, 2 – ii, 3 – iii, 4 – i

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Assume that

(

) undergoes first forbidden

-decay from its ground state with spin-parity

, to a final state

. The possible values for

and

, respectively, are

Your answerChoose one option.

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A radioactive element X has a half-life of 30 hours. It decays via alpha, beta and gamma emissions with the branching ratio for beta decay being 0.75. The partial half-life for beta decay in unit of hours is

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GATE PH concept:beta-decay PYQs

How to practice concept:beta-decay

Question 27

Question 48

Question 19

Question 12

Question 7

Question 48