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Question 19N.3.HL.TZ0.b

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.3.HL.TZ0.b
Level HL Paper 3 Time zone TZ0
Command term Determine Question number b Adapted from N/A
b.
[Maximum mark: 3]
19N.3.HL.TZ0.b

A Σ+ particle decays from rest into a neutron and another particle X according to the reaction

Σ+ → n + X

The following data are available.

Rest mass of Σ+             = 1190 MeV c–2
Momentum of neutron    = 185 MeV c–1

Determine the rest mass of X.

[3]

Markscheme

momentum of X = 185 «MeV c–1»✔

energy of X = 1190 – 958 = 232  «MeV»✔

m0=«2322-1852=»140 «MeV c–2» ✔

NOTE: Allow mass in kg - gives 2.5 × 10–28 «kg»

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