DP Physics (first assessment 2025)

Question EXE.2.HL.TZ0.1aii

Date	Example questions Example questions	Marks available	[Maximum mark: 3]	Reference code	EXE.2.HL.TZ0.1aii
Level	HL	Paper	2	Time zone	TZ0
Command term	Estimate	Question number	ii	Adapted from	N/A

ii.

[Maximum mark: 3]

EXE.2.HL.TZ0.1aii

(ii)

The energy released in the reaction is about 180 MeV. Estimate, in J, the energy released when 1 kg of ${}_{92}^{235}U$ undergoes fission.

[3]

Markscheme

Mass of uranium nucleus $\approx 235 u$ ✓

$\frac{energy}{mass} = \frac{180 \times 10^{6} \times 1.60 \times 10^{- 19}}{235 \times 1.661 \times 10^{- 27}}$ ✓

$7.4 \times 10^{13}$ «J» ✓

Syllabus sections