Figure 12 shows the electromagnetic spectrum - AQA - GCSE Physics - Question 7 - 2019 - Paper 1
Question 7
Figure 12 shows the electromagnetic spectrum.
Which statement is correct for the direction of the arrow in Figure 12?
Tick (✓) one box.
Explain how the properties... show full transcript
Worked Solution & Example Answer:Figure 12 shows the electromagnetic spectrum - AQA - GCSE Physics - Question 7 - 2019 - Paper 1
Step 1
Which statement is correct for the direction of the arrow in Figure 12?
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Answer
The frequency increases and the wave speed in air stays the same.
Step 2
Explain how the properties of X-rays make them suitable for the medical imaging of bones.
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Answer
X-rays are capable of passing through soft tissue, which allows them to reach and penetrate the bones for medical imaging. However, X-rays are absorbed by the dense material of the bones, creating a contrast that allows for clear imaging of the skeletal structure.
Step 3
Suggest how the risk of harm could be reduced in this investigation.
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Answer
One way to reduce risk is to use slightly cooler water instead of boiling water, or to ensure that the kettle is handled carefully to avoid burns.
Step 4
What is the control variable in this investigation?
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Answer
The control variable in this investigation is the distance between the sides of the cube and the infrared detector.
Step 5
Give the reason why.
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Answer
The temperature values in Table 2 cannot be used to show that the infrared detector gives precise readings because measurements for each surface have not been repeated.
Step 6
Explain how using an infrared detector with a resolution of 1 °C would have affected the student's conclusion.
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Answer
Using an infrared detector with a resolution of 1 °C could lead to inaccuracies. If the temperatures measured for a matt white surface and a shiny black surface are close, the precision might not be sufficient to determine which surface emits more infrared radiation, potentially leading to the incorrect conclusion.
