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... 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? Tick (✓) two boxes.
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Answer
The correct options are Microwaves and Radio waves.
Step 2
What is the name given to the dotted line on Figure 5?
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Answer
The name given to the dotted line is the normal.
Step 3
Where the ray of light touches the edge of the optical fibre, it is reflected. Draw the reflected ray on Figure 5.
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Answer
Draw the reflected ray starting from the point of contact on the edge of the optical fibre, at the same angle as the incident ray to create an angle of reflection, ensuring it points to the right of the normal.
Step 4
Suggest the property that optical fibres must have to allow them to bend around corners.
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Answer
Optical fibres need to be flexible.
Step 5
Complete the sentences.
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Answer
This is because green light is transmitted by the filter.
All other colours of light are absorbed by the filter.
