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 applications, such as in airports, where they are used to detect illegal items. X-rays are effective in identifying hidden contrabands by exposing them through their different absorption characteristics.
Step 2
Label the two parts of the scanner.
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Answer
The upper part of the scanner is labeled as the X-ray tube while the lower part is labeled as the detector.
Step 3
Explain how this beam of electrons is produced.
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Answer
The beam of electrons is produced when a heated filament generates electrons. These electrons are emitted from the filament and are attracted towards the anode, which is set at a positive voltage. The potential difference created accelerates the electrons, allowing them to collide with the target material, thereby producing X-rays.
