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A student investigated how the colour of a surface affects the amount of infrared radiation the surface absorbs - AQA - GCSE Physics Combined Science - Question 5 - 2022 - Paper 2
Question 5
A student investigated how the colour of a surface affects the amount of infrared radiation the surface absorbs. Figure 7 shows the equipment used. The two flasks ... show full transcript
Worked Solution & Example Answer:A student investigated how the colour of a surface affects the amount of infrared radiation the surface absorbs - AQA - GCSE Physics Combined Science - Question 5 - 2022 - Paper 2
Step 1
Explain two improvements to the method the student used.
Answer
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Use the same distance from the infrared lamp for each flask: Placing both flasks at an equal distance ensures that they receive the same intensity of infrared radiation, eliminating variables caused by distance.
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Ensure equal volumes of water in each flask: Using equal volumes maintains consistency in how quickly the water temperatures can change, making the experiment more reliable.
Step 2
Step 3
Step 4
Step 5
Explain why the temperature of the water in the flasks increased and then became constant.
Answer
The flasks absorb infrared radiation and transfer energy to the surroundings through emission of infrared.
Initially, the rate of absorption of infrared is greater than the rate of energy transfer to surroundings, causing the temperature to increase. As the temperature of the flasks rises, the rate of energy transfer to the surroundings also increases until it equals the rate of absorption, resulting in a constant temperature.