DP Physics (last assessment 2024)

Question 17N.3.HL.TZ0.7b

Date	November 2017	Marks available	[Maximum mark: 2]	Reference code	17N.3.HL.TZ0.7b
Level	HL	Paper	3	Time zone	TZ0
Command term	Determine	Question number	b	Adapted from	N/A

[Maximum mark: 2]

17N.3.HL.TZ0.7b

The ${\Lambda ^0}$ (Lambda) particle decays spontaneously into a proton and a negatively charged pion of rest mass 140 MeV c^–2. After the decay, the particles are moving in the same direction with a proton momentum of 630 MeV c^–1 and a pion momentum of 270 MeV c^–1.

(b)

Determine, using your answer to (a), the initial speed of the ${\Lambda ^0}$ particle.

[2]

Markscheme

«E = $\gamma$ mc² so» $\gamma$ = « $\frac{{1434}}{{1116}}$ =» 1.28

to give 0.64c

Syllabus sections

Option A: Relativity

Option A: Relativity » Option A: Relativity (Additional higher level option topics) » A.4 – Relativistic mechanics (HL only)

Option A: Relativity » Option A: Relativity (Additional higher level option topics)

Question 17N.3.HL.TZ0.7b

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