DP Physics (first assessment 2025)

Question EXE.2.HL.TZ0.1biii

Date	Example questions Example questions	Marks available	[Maximum mark: 1]	Reference code	EXE.2.HL.TZ0.1biii
Level	HL	Paper	2	Time zone	TZ0
Command term	Show that	Question number	iii	Adapted from	N/A

iii.

[Maximum mark: 1]

EXE.2.HL.TZ0.1biii

(iii)

Show that the decay constant of a nuclide is given by −m, where m is the slope of the graph of lnA against t.

[1]

Markscheme

Takes ln of both sides of $A = A_{0} e^{- λ t}$ , leading to $\ln A = \ln A_{0} - λ t$ ✓

«hence slope $= - λ$ » ✓

Syllabus sections