A CAT scanner uses X-rays - Edexcel - GCSE Physics - Question 3 - 2015 - Paper 1
Question 3
A CAT scanner uses X-rays.
It is used in hospitals to ‘see’ inside the body.
(i) Describe one other use of X-rays.
(ii) The diagram shows a CAT scanner in use.
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Worked Solution & Example Answer:A CAT scanner uses X-rays - Edexcel - GCSE Physics - Question 3 - 2015 - Paper 1
Step 1
Describe one other use of X-rays.
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Answer
One other use of X-rays is in security at airports, where they help to scan luggage and detect illegal items such as weapons. X-rays are effective because they can penetrate materials and create images based on different density levels.
Step 2
Label the two parts of the scanner.
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Answer
The upper part of the scanner should be labeled as 'X-ray tube' and the lower part should be labeled as 'detector'.
Step 3
Explain how this beam of electrons is produced.
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Answer
A beam of electrons is produced by heating a filament, which generates a cloud of electrons around it. This cloud is then accelerated towards the anode by applying a high voltage, typically across a vacuum, allowing the electrons to stream towards the target and produce X-rays upon impact.
