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Physics Module 4 > Fission And Fusion > Flashcards

Flashcards in Fission And Fusion Deck (13):
1

Describe the main stages in the production of electricity

- nuclear reaction takes place to produce heat
- heat creates steam from water
- steam turns a turbine
- the turbine turns a generator, to produce electricity

2

What does nuclear fission produce

Radioactive waste

3

Describe the difference between fission and fusion

- fission is splitting of nuclei
- fusion is the joining of nuclei

4

How many scientists have claimed to successfully achieve 'cold fusion'?

One group

5

Explain why the scientists claims are disputed (cold fusion)

Because other scientists could not repeat their findings

6

Describe what happens to allow uranium to release energy

- uranium nucleus hit by neutron
- causes nucleus to split
- energy released
- more neutrons released

7

Explain what is meant by a chain reaction

- when each uranium nucleus splits more than one neutron is given out
- these neutrons can cause further uranium nuclei to split

8

Explain how scientists stop nuclear reactions going out of control

- rods placed in the reactor
- to absorb some of the neutrons
- allowing enough neutrons to remain to keep the process operating

9

Describe nuclear bomb

A chain reaction that has gone out of control

10

Describe how nuclear fusion release energy

- fusion happens when two nuclei join together
- fusion happens large amounts of heat energy
- fusion happens at extremely high temperatures

11

Describe why fusion for power generation is difficult

- requires extremely high temperatures
- high temperatures have to be safely managed

12

Explain how different isotopes of hydrogen can undergo fusion to form helium

- in stars, fusion happens under extremely high temperatures and pressures
- fusion bombs are started with a fission reaction which creates exceptionally high temperatures
- for power generation exceptionally high temperatures and/or pressures are requires and this combustion offers (to date) safety and practical changes

13

What fuel do nuclear power stations use

Uranium