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Edexcel | Physics 4PH0 | W 17 1 | Q12

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12

The diagram shows the main parts of a nuclear reactor.

12

(a)

4 Mark s

Draw a straight line linking each part of the reactor to its correct purpose.

5 correct lines score 4 marks;;;;

4 or 3 correct lines score 3 marks;;;

2 correct lines score 2 marks;;

1 correct line scores 1 mark;

12

(b)

1 Mark

Which of these is a nuclear fission product?

A alpha particles

B electrons

C neutrons

D uranium nuclei

C neutrons;

12

(c)

4 Mark s

Describe the process of nuclear fission.

any four from:

MP1. neutron absorbed by;

MP2. uranium(-235) nucleus;

MP3. causing it to split;

MP4. into 2 daughter products /nuclei

/ isotopes;

MP5. releasing further neutrons /energy;

only accept precise

terminology

allow

hits/collides/eq

allow named

products

12

(d)

3 Mark s

State three ways in which nuclear fission differs from radioactive decay.

any three comparisons from (however

expressed):

MP1. decay is random but fission is not;

MP2. fission induced by input particle but

decay occurs without an input particle;

MP3. fission produces 2 daughter nuclei

but decay produces only 1;

MP4. α or β are emitted from decay but

not from fission;

MP5. decay rate can’t be altered but rate

of fission can;

MP6. Number of fissionable isotopes

much less than radioactive isotopes;

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