DP Physics (first assessment 2025)

Question EXE.2.SL.TZ0.b

Date	Example questions Example questions	Marks available	[Maximum mark: 3]	Reference code	EXE.2.SL.TZ0.b
Level	SL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	b	Adapted from	N/A

[Maximum mark: 3]

EXE.2.SL.TZ0.b

Every neutron-induced fission reaction of uranium-235 releases an energy of about 200 MeV. A nuclear power station transfers an energy of about 2.4 GJ per second.

Determine the mass of uranium-235 that undergoes fission in one day in this power station.

[3]

Markscheme

Fissions per day $= \frac{2.4 \times 10^{9} \times 60 \times 60 \times 24}{200 \times 10^{6} \times 1.6 \times 10^{- 19}}$ « $= 6.5 \times 10^{24}$ » ✓

Mass of uranium $= \frac{6.5 \times 10^{24}}{6.05 \times 10^{23}} \times 0.235$ ✓

2.5 «kg» ✓

Syllabus sections

E. Nuclear and quantum physics

E. Nuclear and quantum physics » E.3 Radioactive decay

E. Nuclear and quantum physics » E.4 Fission

Question EXE.2.SL.TZ0.b

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