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Nuclear and particle physics

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Question 13

An anti-strange quark (sˉ\bar{s}sˉ) is a fundamental particle. Which row in the table correctly identifies the charge, baryon number, and strangeness of an anti-strange quark?

Charge (e)Baryon number (B)Strangeness (S)A−13+13−1B+13−13+1C+13+13−1D−13−13+1 \begin{array}{|c|c|c|c|} \hline & \text{Charge } (e) & \text{Baryon number } (B) & \text{Strangeness } (S) \\ \hline \text{A} & -\frac{1}{3} & +\frac{1}{3} & -1 \\ \hline \text{B} & +\frac{1}{3} & -\frac{1}{3} & +1 \\ \hline \text{C} & +\frac{1}{3} & +\frac{1}{3} & -1 \\ \hline \text{D} & -\frac{1}{3} & -\frac{1}{3} & +1 \\ \hline \end{array} ABCD​Charge (e)−31​+31​+31​−31​​Baryon number (B)+31​−31​+31​−31​​Strangeness (S)−1+1−1+1​​
A

Row A

B

Row B

C

Row C

D

Row D

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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