Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 1
Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
a pencil and a ruler Question Mark
a scientific calculator 1
a Data and Formulae Booklet 2
a protractor.
3
Instructions 4
Use black ink or black ball-point pen. 5
Fill in the boxes at the top of this page.
Answer all questions. 6
You must answer the questions in the spaces provided. Do not write 7–31
outside the box around each page or on blank pages.
TOTAL
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s).
Do all rough work in this book. Cross through any work you do not want
to be marked.
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 85.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun21/E8 7408/1
, 2
Do not
Do not write
write
outside the
outside the
Section A box
box
Answer all questions in this section.
0 1 Cosmic rays are high-energy particles that come from space. Most of these particles
are protons. There are other particles in cosmic rays, including atomic nuclei.
Table 1 gives the data for one particular nucleus X.
Table 1
Mass / kg 8.02 × 10−26
Specific charge / C kg−1 4.39 × 107
Kinetic energy / MeV 215
0 1 . 1 Determine the number of neutrons in nucleus X.
[3 marks]
number of neutrons =
0 1
. 2 Calculate the speed of X.
Ignore relativistic effects.
[3 marks]
speed = ________________________ m s−1
IB/M/Jun21/7408/1
, 3
Turn
A pion (π+) and a kaon (K+) are produced when cosmic rays interact with the upper over ►
atmosphere.
0 1
. 3 The π+ decays to produce a positron and an electron neutrino.
Show how the conservation laws apply to this decay.
[2 marks]
0 1 . 4 The K+ decays to produce an anti-muon and a muon neutrino.
Explain how strangeness applies in this decay.
[2 marks]
0 1 . 5 Write an equation for a K+ decay that involves only hadrons.
[2 marks]
IB/M/Jun21/7408/1
, 4
Do not write outside the box
12
IB/M/Jun21/7408/1
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 1
Time allowed: 2 hours
Materials For Examiner’s Use
For this paper you must have:
a pencil and a ruler Question Mark
a scientific calculator 1
a Data and Formulae Booklet 2
a protractor.
3
Instructions 4
Use black ink or black ball-point pen. 5
Fill in the boxes at the top of this page.
Answer all questions. 6
You must answer the questions in the spaces provided. Do not write 7–31
outside the box around each page or on blank pages.
TOTAL
If you need extra space for your answer(s), use the lined pages at the end of
this book. Write the question number against your answer(s).
Do all rough work in this book. Cross through any work you do not want
to be marked.
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 85.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun21/E8 7408/1
, 2
Do not
Do not write
write
outside the
outside the
Section A box
box
Answer all questions in this section.
0 1 Cosmic rays are high-energy particles that come from space. Most of these particles
are protons. There are other particles in cosmic rays, including atomic nuclei.
Table 1 gives the data for one particular nucleus X.
Table 1
Mass / kg 8.02 × 10−26
Specific charge / C kg−1 4.39 × 107
Kinetic energy / MeV 215
0 1 . 1 Determine the number of neutrons in nucleus X.
[3 marks]
number of neutrons =
0 1
. 2 Calculate the speed of X.
Ignore relativistic effects.
[3 marks]
speed = ________________________ m s−1
IB/M/Jun21/7408/1
, 3
Turn
A pion (π+) and a kaon (K+) are produced when cosmic rays interact with the upper over ►
atmosphere.
0 1
. 3 The π+ decays to produce a positron and an electron neutrino.
Show how the conservation laws apply to this decay.
[2 marks]
0 1 . 4 The K+ decays to produce an anti-muon and a muon neutrino.
Explain how strangeness applies in this decay.
[2 marks]
0 1 . 5 Write an equation for a K+ decay that involves only hadrons.
[2 marks]
IB/M/Jun21/7408/1
, 4
Do not write outside the box
12
IB/M/Jun21/7408/1
