Question 39
Question 39 of 40
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
11. Particle physics
11.1. Atoms, nuclei and radiation

represent α- and β-decay by a radioactive decay equation of the form 238 92 U → 234 90 Th + 4 2 α

11. Particle physics
11.2. Fundamental particles

describe the changes to quark composition that take place during β− and β+ decay

23. Nuclear physics
23.2. Radioactive decay

understand the exponential nature of radioactive decay, and sketch and use the relationship x = x0e^(-λt), where x could represent activity, number of undecayed nuclei or received count rate