ACTUAL 2025 AQA AS PHYSICS Paper 1 Question Paper.
Worked Exam Solutions. Mark Scheme Attached
Wednesday 14 May 2025 [VERIFIED]
, 2
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outside the
Answer all questions in the spaces provided. box
0 1 Hydrogen has three naturally occurring isotopes. One of these isotopes is
hydrogen-3 1 3H .
0 1 . 1 Calculate the specific charge of a nucleus of hydrogen-3.
[2 marks]
specific charge =__________________________ C kg−1
0 1 . 2 The specific charge of the hydrogen-3 nucleus is less than the specific charges of the nuclei of
the other two isotopes.
Suggest why.
[2 marks]
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Kaons (K) and pions (π) are produced when a beam of antiprotons is incident on a sample box
of hydrogen gas.
One reaction that occurs is
p p K π K0
0 1 . 3 Deduce, with reference to appropriate conservation laws, the quark structure of the
K0 produced in this reaction.
[3 marks]
quark structure =
0 1 . 4 One possible decay of a π+ particle is
π+ A+B
where A is a charged lepton.
Suggest, with reference to appropriate conservation laws, the name of A and the name of B.
[2 marks]
name of A
name of B 9
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0 2 An optical fibre consists of a glass core surrounded by cladding. box
Monochromatic light enters the glass core of the optical fibre from air.
0 2 . 1 What happens to the frequency of the light as it enters the glass core?
Tick ( ) one box.
[1 mark]
It decreases.
It is unchanged.
It increases.
The refractive index of the glass core is 1.51
0 2 . 2 The critical angle at the core–cladding boundary is 80.7°
Calculate the refractive index of the cladding.
[2 marks]
refractive index of cladding =
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IB/M/Jun25/7407/1
Worked Exam Solutions. Mark Scheme Attached
Wednesday 14 May 2025 [VERIFIED]
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Hydrogen has three naturally occurring isotopes. One of these isotopes is
hydrogen-3 1 3H .
0 1 . 1 Calculate the specific charge of a nucleus of hydrogen-3.
[2 marks]
specific charge =__________________________ C kg−1
0 1 . 2 The specific charge of the hydrogen-3 nucleus is less than the specific charges of the nuclei of
the other two isotopes.
Suggest why.
[2 marks]
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7407/1
, 3
Do not write
outside the
Kaons (K) and pions (π) are produced when a beam of antiprotons is incident on a sample box
of hydrogen gas.
One reaction that occurs is
p p K π K0
0 1 . 3 Deduce, with reference to appropriate conservation laws, the quark structure of the
K0 produced in this reaction.
[3 marks]
quark structure =
0 1 . 4 One possible decay of a π+ particle is
π+ A+B
where A is a charged lepton.
Suggest, with reference to appropriate conservation laws, the name of A and the name of B.
[2 marks]
name of A
name of B 9
Turn over ►
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7407/1
, 4
Do not write
outside the
0 2 An optical fibre consists of a glass core surrounded by cladding. box
Monochromatic light enters the glass core of the optical fibre from air.
0 2 . 1 What happens to the frequency of the light as it enters the glass core?
Tick ( ) one box.
[1 mark]
It decreases.
It is unchanged.
It increases.
The refractive index of the glass core is 1.51
0 2 . 2 The critical angle at the core–cladding boundary is 80.7°
Calculate the refractive index of the cladding.
[2 marks]
refractive index of cladding =
tyrionpapers.com for more resources tyrionpapers.com
IB/M/Jun25/7407/1
