DP Physics (last assessment 2024)

Question 20N.2.SL.TZ0.a(iii)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.SL.TZ0.a(iii)
Level	SL	Paper	2	Time zone	TZ0
Command term	Show that	Question number	a(iii)	Adapted from	N/A

a(iii).

[Maximum mark: 1]

20N.2.SL.TZ0.a(iii)

One possible fission reaction of uranium-235 (U-235) is

${}_{92}^{235}U + {}_{0}^{1}n \to {}_{54}^{140}{Xe} + {}_{38}^{94}{Sr} + 2 {}_{0}^{1}n$

Mass of one atom of U-235 $= 235 u$
Binding energy per nucleon for U-235 $= 7.59 MeV$
Binding energy per nucleon for Xe-140 $= 8.29 MeV$
Binding energy per nucleon for Sr-94 $= 8.59 MeV$

Show that the energy released in the reaction is about $180 MeV$ .

[1]

Markscheme

$140 \times 8.29 + 94 \times 8.59 - 235 \times 7.59$ OR $184 « MeV »$ ✓

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Core

Core » Topic 7: Atomic, nuclear and particle physics » 7.2 – Nuclear reactions

Core » Topic 7: Atomic, nuclear and particle physics

Question 20N.2.SL.TZ0.a(iii)

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