Question 1

Nobelium-259 has a half-life of 3,500 s.

What is the decay constant of nobelium-259?

  A  

8.7 × 10−5 s−1


  B  

2.0 × 10−4 s−1


  C  

1.7 × 10−2 s−1


  D  

1.2 × 10−2 s−1


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Question 2

A pure sample of nuclide X containing N nuclei has an activity A.

The half-life of X is 6,000 years.

A pure sample of nuclide Y containing 3N nuclei has an activity 6A.

What is the half-life of nuclide Y?

  A  

1,000 years

  B  

3,000 years

  C  

12,000 years

  D  

18,000 years

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Question 3

Cobalt-60 has a half-life of 5.27 years.

What is the total activity of 1.0 g of cobalt-60?

  A  

4.2 × 1013 Bq


  B  

2.2 × 1014 Bq


  C  

2.5 × 1015 Bq


  D  

1.3 × 1021 Bq


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Question 4

Which of the following best describes the decay constant for a radioisotope?

  A  

the reciprocal of the half-life of the radioisotope

  B  

the rate of decay of the radioisotope


  C  

the constant of proportionality which links half-life to the rate of decay of nuclei

  D  

the constant of proportionality which links rate of decay to the number of undecayed nuclei

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Question 5

After 64 days the activity of a radioactive nuclide has fallen to one sixteenth of its original value. The half-life of the radioactive nuclide is

  A  

2 days


  B  

4 days


  C  

8 days


  D  

16 days


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Question 6

X and Y are two radioactive nuclides. X has a half-life of 3.0 minutes and Y has a half-life of 9.0 minutes. 

Two freshly prepared samples of X and Y start decaying at the same time.

After 18 minutes the number of radioactive nuclei in both samples is the same.

The sample of Y initially contained N radioactive nuclei.

What was the initial number of radioactive nuclei in the sample of X?

  A  

4N

  B  

16N

  C  

32N

  D  

64N

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Question 7

The number of parent nuclei in a sample of a radioactive element is N at time t.

The radioactive element has a half-life t12t{\frac{1}{2}}

The rate of decay is proportional to

N
t
t1​
t21​​

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Question 8

U++ is a doubly-ionised uranium atom. The uranium atom has a nucleon number of 235 and a proton number of 92.

In a simple model of the atom, how many particles are in this ionised atom?

  A  

235

  B  

325

  C  

327

  D  

329

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Question 9

Uranium-236 undergoes nuclear fission to produce barium-144, krypton-89 and three free neutrons.

What is the energy released in this process?

  A  

84 MeV

  B  

106 MeV

  C  

191 MeV

  D  

3,730 MeV

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Question 10

The table shows the masses of three particles.

What is the mass difference of the Li-7 nucleus?

  A  

4.99841 u


  B  

0.04216 u


  C  

0.04147 u


  D  

0.04077 u


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