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Nuclear and particle physics

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Question 40

Which of the following statements correctly describe the characteristics of radioactive decay?

  1. The decay constant λ \lambda\,λ represents the probability of decay per unit time for an individual nucleus, and its value is unaffected by whether the isotope is in elemental form or within a chemical compound.
  2. The total mass of a radioactive sample decreases by exactly 50% after a period of time equal to one half-life has elapsed.
  3. A graph of the natural logarithm of the sample's activity, ln⁡(A)\ln(A)ln(A), against time, ttt, is a straight line with a gradient equal to −λ-\lambda−λ.
A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2, and 3

Markscheme

Nuclear and particle physics Questions

  1. A Level
  2. /Physics
  3. /Nuclear and particle physics

90 exam-style questions on OCR A A Level Physics Nuclear and particle physics, covering The nuclear atom, Fundamental particles, Radioactivity, and Nuclear fission and fusion. Each one has a worked solution and a mark scheme showing where the marks go.

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