DP Physics (last assessment 2024)

Question 21M.2.HL.TZ2.4b

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.HL.TZ2.4b
Level	HL	Paper	2	Time zone	TZ2
Command term	Explain	Question number	b	Adapted from	N/A

[Maximum mark: 2]

21M.2.HL.TZ2.4b

(b)

The neutron number N and the proton number Z are not equal for the nuclide ${}_{81}^{205}{Tl}$ . Explain, with reference to the forces acting within the nucleus, the reason for this.

[2]

Markscheme

Reference to proton repulsion OR nucleon attraction ✓

strong force is short range OR electrostatic/electromagnetic force is long range ✓

more neutrons «than protons» needed «to hold nucleus together» ✓

Syllabus sections

Core

Core » Topic 7: Atomic, nuclear and particle physics » 7.3 – The structure of matter

Core » Topic 7: Atomic, nuclear and particle physics

Question 21M.2.HL.TZ2.4b

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