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Question 22M.2.SL.TZ1.5b

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.SL.TZ1.5b
Level SL Paper 2 Time zone TZ1
Command term Identify Question number b Adapted from N/A
b.
[Maximum mark: 2]
22M.2.SL.TZ1.5b
(b)

The Feynman diagram shows a possible decay of the K+ meson.

Identify the interactions that are involved at points A and B in this decay.

[2]

Markscheme

A «Decay of the strange antiquark is a» weak «interaction» ✓

B «Decay of the u to a gluon and eventually to d and anti-d is a» strong «interaction» ✓

Examiners report

Many candidates were able to successfully identify the two interactions in the diagram. Some candidates only described what was happening in the diagram without identifying the actual interaction. A common mistake was identifying the gluon at B as a graviton, and/or suggesting that this was a gravitational interaction. Many candidates also did not make the connection between the term "interaction" in the stem and the concept of force.

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