DP Physics (last assessment 2024)

Question 20N.2.HL.TZ0.b(i)

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.HL.TZ0.b(i)
Level	HL	Paper	2	Time zone	TZ0
Command term	Estimate	Question number	b(i)	Adapted from	N/A

b(i).

[Maximum mark: 2]

20N.2.HL.TZ0.b(i)

A nuclear power station uses U-235 as fuel. Assume that every fission reaction of U-235 gives rise to $180 MeV$ of energy.

Estimate, in $J {kg}^{- 1}$ , the specific energy of U-235.

[2]

Markscheme

see $« energy = » 180 \times 10^{6} \times 1.60 \times 10^{- 19}$ AND $« mass = » 235 \times 1.66 \times 10^{- 27}$ ✓

$7.4 \times 10^{13} « J {kg}^{- 1} »$ ✓

Examiners report

This caused problems for some with mass often correctly calculated but energy causing more difficulty with the eV conversion either being inaccurate or omitted. Candidates were allowed error carried forward for the second mark as long as they were dividing an energy by a mass.

Syllabus sections

Core

Core » Topic 8: Energy production » 8.1 – Energy sources

Core » Topic 8: Energy production

Question 20N.2.HL.TZ0.b(i)

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