Figure 11 shows the position of three types of wave in the electromagnetic spectrum - AQA - GCSE Physics - Question 4 - 2019 - Paper 1
Question 4
Figure 11 shows the position of three types of wave in the electromagnetic spectrum.
Which letter represents infrared in the electromagnetic spectrum? Tick (✓) one ... show full transcript
Worked Solution & Example Answer:Figure 11 shows the position of three types of wave in the electromagnetic spectrum - AQA - GCSE Physics - Question 4 - 2019 - Paper 1
Step 1
Which letter represents infrared in the electromagnetic spectrum?
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Answer
The letter that represents infrared in the electromagnetic spectrum is B.
Step 2
What is infrared used for?
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Answer
Infrared is used for electrical heating.
Step 3
How does the image of a trapped person change if the person's body temperature drops from 37 °C to 33 °C?
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Answer
The image of a trapped person would change to appear more red as a drop in temperature would reduce the infrared radiation emitted by the body.
Step 4
Complete the sentence.
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Answer
In this investigation the type of surface is the independent variable.
In this investigation the type of surface is the dependent variable.
Step 5
Describe how the equipment shown in Figure 13 would be used to compare the infrared radiation emitted from the vertical surfaces of the cube.
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Answer
To compare the infrared radiation emitted from the vertical surfaces of the cube, hot water is poured into the hollow metal cube. The infrared detector is pointed at each of the cube's vertical surfaces while ensuring that the detector is kept at the same distance from each surface. A reading is taken from the detector for each surface.
Step 6
What is the resolution of the infrared detector?
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The resolution of the infrared detector is 0.1 °C.
Step 7
Complete the bar chart to show all of the results.
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Answer
A bar chart must be completed with data reflecting the results observed from the experiment, indicating the amount of infrared emitted from various surfaces.
Step 8
Give one conclusion that can be made from the results.
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One conclusion that can be made from the results is that the type of surface significantly affects the amount of infrared radiation emitted, with matte black being the best emitter while shiny silver is the worst.
