Figure 5 shows a diver - AQA - GCSE Physics Combined Science - Question 3 - 2018 - Paper 1
Question 3
Figure 5 shows a diver.
The diver is using a canister of compressed air so that he can breathe underwater.
**Figure 5**
*Canister of compressed air*
Which two s... show full transcript
Worked Solution & Example Answer:Figure 5 shows a diver - AQA - GCSE Physics Combined Science - Question 3 - 2018 - Paper 1
Step 1
Which two sentences describe the movement of the air particles in the canister?
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Answer
The correct sentences are:
They move in random directions.
They move with a range of different speeds.
Step 2
What happens to the movement of the air particles?
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Answer
As the temperature of the air inside the canister increases, the mean speed of the particles will increase. This means that the particles will move faster and collide more often, resulting in increased kinetic energy.
Step 3
Explain why.
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Answer
If the temperature of the air inside the canister increases significantly, it can lead to an increase in pressure. This may cause a large pressure difference between the canister and the outside environment, potentially leading to an explosion or failure of the canister.
Step 4
Estimate the atmospheric pressure.
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Answer
From Figure 6, the estimated atmospheric pressure is 0.1 MPa.
Step 5
Determine the maximum time the diver can safely stay underwater.
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Answer
From Figure 6, to determine when the pressure drops to 25% of its original value of 2.25 MPa:
25% of 2.25 MPa = 0.56 MPa.
The maximum time the diver can safely stay underwater is approximately 27 minutes.
Step 6
What happens to the volume of the air when it is released from the canister?
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Answer
When the air is released from the canister, the volume of the air increases due to the drop in pressure, as per Boyle's Law which states that pressure and volume are inversely proportional when temperature is constant.
