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 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 3>Q 2

EASY

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IMPORTANT

Earn 100

Which among the following statements is not true?

50% studentsanswered this correctly

Important Questions on Atoms and Nuclei

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 3

The activity of a radioactive sample is measured as

9750

counts per minute at

t = 0

and as

975

counts per minute at

t = 5

minutes. The decay constant is approximately,

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 4

The decay constant of a radioisotope is

λ

. If $A_{1}$ and

A_{2}

are its activities at times $t_{1}$ and $t_{2}$ , respectively, then the number of nuclei decayed during the time

(t_{2} - t_{1})

is

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 5

Radioactive element decays to form a stable nuclide, then the rate of decay of reactant is shown by

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 6

Which, among the following, is a correct statement?

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 7

For a certain radioactive process, the graph between $\ln R$ and $t (\sec)$ is obtained as shown in the figure. Then the value of half life for the unknown radioactive material is approximately:

Question Image

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Physics Crash Course NEET>Chapter 20 - Atoms and Nuclei>Level 3>Q 8

There are $10^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is $1 \min$ . How many nuclei will remain after $30 s$ ? $(\sqrt{2} = 1.414)$