Visible light is used for communications - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Question 4
Visible light is used for communications.
Which other parts of the electromagnetic spectrum are used for communications?
Tick (✓) two boxes.
Gamma rays
Microwaves
R... show full transcript
Worked Solution & Example Answer:Visible light is used for communications - AQA - GCSE Physics - Question 4 - 2020 - Paper 1
Step 1
Which other parts of the electromagnetic spectrum are used for communications?
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Answer
Microwaves: Often used in communication technologies including mobile phones and satellite communications.
Radio waves: Primarily used for broadcasting television and radio signals.
Step 2
What is the name given to the dotted line on Figure 5?
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Answer
Normal: This is the line perpendicular to the surface of the optical fibre at the point of incidence.
Step 3
Draw the reflected ray on Figure 5.
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Answer
A ray of light drawn to the right of the normal (indicating reflection), where the angle of incidence equals the angle of reflection.
Step 4
Suggest the property that optical fibres must have to allow them to bend around corners.
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Answer
They need to be flexible: This flexibility helps optical fibres to bend without breaking, allowing for versatile applications.
Step 5
Complete the sentences.
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Answer
When white light is incident on a green filter, only green light passes through the filter.
This is because green light is transmitted by the filter.
All other colours of light are absorbed by the filter.
