DP Physics (last assessment 2024)

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Question 22N.2.HL.TZ0.b

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.HL.TZ0.b
Level HL Paper 2 Time zone TZ0
Command term Estimate Question number b Adapted from N/A
b.
[Maximum mark: 2]
22N.2.HL.TZ0.b

The Feynman diagram shows a delta baryon (Δ) decaying into a neutron and particle X.

The exchange particle involved in the decay is a gluon. Particle X has two constituent quarks.

The energy released in the decay is of the order of 108 eV.

Estimate, using the uncertainty principle, the mean lifetime of the delta baryon.

[2]

Markscheme

108×1.6×10-19  OR  1.6×10-11 seen ✓

Δt ≅6.63×10-344π×108×1.60×10-19=3×10-24 «s» ✓

 

Award [2] for a BCA.

Award [1] for an answer of 5.3 × 10−43 s.

Allow ECF from MP1.

Examiners report

The most common problem was no conversion from eV.

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