# Basic Physics of Nuclear Medicine/The Radioactive Decay Law MCQ

1. 1 MBq is equal to:

 1 billion decays per second 37 thousand, million curies 1 decay per second 1 million decays per second → Correct Answer - see Units of Radioactivity.

2. The Half Life of 99m-Tc is 6 hours. After how much time will one eighth of the radioactivity in a sample remain?

 6 hours 12 hours 18 hours → Correct Answer - see Half Life. 24 hours

3. The Half Life is:

 the reciprocal of the Decay Constant the time taken for the number of radioactive nuclei to decrease by a factor of 2 → Correct Answer - see Half Life. the time taken for the number of radioactive nuclei to increase by a factor of 2 the Decay Constant multiplied by the natural logarithm of 2

4. The Decay Constant is a measure of:

 only the number of alpha particles emitted only the number of beta particles emitted only the number of gamma rays emitted none of the above → Correct Answer - see The Radioactive Decay Law.

5. If ln x = y, then:

 ln y = x exp y = x → Correct Answer - see The Radioactive Decay Law. exp y = -x exp -y = x

6. When the Half Life increases:

 the Decay Constant increases the Decay Constant decreases → Correct Answer - see Relationship between the Decay Constant and the Half Life. the Decay Constant remains unchanged none of the above happen

7. A linear relationship is obtained between the number of radioactive nuclei and time when it is plotted:

 on a log-log graph on a log-linear graph → Correct Answer - see The Radioactive Decay Law. on a linear-linear graph on a square-linear graph

8. The number of nuclei which decay between t and t+dt is proportional to:

 the number of nuclei only the time interval only the quotient of the number of nuclei and the time interval the product of the number of nuclei and the time interval → Correct Answer - see The Radioactive Decay Law.

9. The Radioactive Decay Law is expressed by:

 an exponential function → Correct Answer - see The Radioactive Decay Law. a logarithmic function a sinusoidal function a linear function

10. When the Decay Constant increases:

 the Half Life decreases → Correct Answer - see Relationship between the Decay Constant and the Half Life. the Half Life increases the Half Life remains unchanged none of the above happen

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