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Complete the sentence by putting a cross (×) in the box next to your answer - Edexcel - GCSE Physics - Question 2 - 2016 - Paper 1

Question 2

Complete the sentence by putting a cross (×) in the box next to your answer. The difference between fission and fusion is that only fission A) creates new nuclei B)... show full transcript

Worked Solution & Example Answer:Complete the sentence by putting a cross (×) in the box next to your answer - Edexcel - GCSE Physics - Question 2 - 2016 - Paper 1

Step 1

Complete the sentence

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Answer

The difference between fission and fusion is that only fission B) is triggered by neutrons.

Step 2

Insert the correct numbers into the sentence

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Answer

A nucleus of uranium-235 contains 92 protons and 143 neutrons.

Step 3

Describe the purpose of the moderator in a nuclear fission reactor

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Answer

The purpose of the moderator in a nuclear fission reactor is to slow down the fast neutrons produced during fission reactions. Slower neutrons are more likely to cause further fission reactions in uranium-235, increasing the efficiency of the reactor and allowing a sustained chain reaction.

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