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 sent... 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
When the temperature of the air inside the canister increases, the mean speed of the air particles also increases. This results in faster movement as the kinetic energy of the particles rises.
Step 3
Explain why.
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Answer
If the temperature increases significantly, the pressure inside the canister also increases. This creates a large pressure difference, which could lead to the canister exploding if it exceeds its structural limits.
Step 4
Estimate the atmospheric pressure.
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Answer
Using Figure 6, the atmospheric pressure is estimated to be 0.1 MPa.
Step 5
Determine the maximum time the diver can safely stay underwater.
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Answer
The pressure must drop to 25% of its original value for safe diving, which is 0.56 MPa. Referring to Figure 6, the diver can safely stay underwater for 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
The volume of the air increases when it is released from the canister.
