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Pearson Edexcel International Advanced Level
Monday 15 January 2024
Afternoon (Time: 1 hour 45 minutes) Paper
reference WPH15/01
Physics
International Advanced Level
UNIT 5: Thermodynamics, Radiation, Oscillations
and Cosmology
You must have: Total Marks
Scientific calculator, ruler
Instructions
•• Use black ink or ball-point pen.
If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
• Show all your working out in calculations and include units where appropriate.
Information
•• The total mark for this paper is 90.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• toIn the question marked with an asterisk (*), marks will be awarded for your ability
structure your answer logically, showing how the points that you make are
related or follow on from each other where appropriate.
• The list of data, formulae and relationships is printed at the end of this booklet.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end. Turn over
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
For questions 1–10, in Section A, select one answer from A to D and put a cross in the box . If you
change your mind, put a line through the box and then mark your new answer with a cross .
1 Ice at 0 °C melts into water at 0 °C.
Which row of the table gives the changes in mean molecular kinetic energy and mean
molecular potential energy as the ice melts?
Mean molecular Mean molecular
kinetic energy potential energy
A no change no change
B no change increases
C increases no change
D increases increases
(Total for Question 1 = 1 mark)
2 Astronomers can use stellar parallax to determine the distances to stars.
Which of the following statements is correct?
A Measurements are made against more distant stars.
B Stellar parallax can only be used for distant stars.
C The luminosity of the star must be constant.
D The parallax effect is greatest for the most distant stars.
(Total for Question 2 = 1 mark)
2
*P75599A0232*
, 3 The mass of a muon is 0.113 u.
Which of the following is equal to the equivalent mass‑energy, in joules, of the muon?
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A 0.113 × (3.0 × 108 )2
0.113
B
(3.0 × 108 ) 2
C 0.113 × (3.0 × 108 )2 × 1.66 × 10–27
D 0.113 × (3.0 × 108 )2 × 1.67 × 10–27
(Total for Question 3 = 1 mark)
4 A mass is oscillating with simple harmonic motion.
Which of the following statements about the acceleration of the mass is correct?
A The acceleration is always in the opposite direction to the velocity.
B The acceleration is always in the same direction as the velocity.
C The acceleration is always away from the equilibrium position.
D The acceleration is always towards the equilibrium position.
(Total for Question 4 = 1 mark)
5 Which of the following correctly describes the spontaneous nature of radioactive decay?
A Radioactive decay is a natural process.
B Radioactive decay is a random process.
C We cannot influence when the decay will occur.
D We cannot predict when the next decay will occur.
(Total for Question 5 = 1 mark)
3
*P75599A0332* Turn over
, 6 The planet Mercury orbits the Sun in an elliptical orbit. As a result, the speed of
Mercury varies as it orbits the Sun.
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Which row of the table shows how the speed and gravitational potential energy of
Mercury change as Mercury approaches the Sun?
Gravitational potential energy Speed
A decreases decreases
B decreases increases
C increases decreases
D increases increases
(Total for Question 6 = 1 mark)
7 A mass oscillates with simple harmonic motion. The mass has an angular velocity of
2 rad s–1 and a maximum velocity of 10 cm s–1.
Which of the following gives the magnitude of the amplitude A of the oscillation in cm?
2
A A=
10
10
B A=
2
2 sin 2t
C A=
10
10
D A=
2 sin 2t
(Total for Question 7 = 1 mark)
8 A mixture of helium gas and hydrogen gas is kept at room temperature.
Which of the following is correct?
A The mean kinetic energy of the helium molecules is greater than the mean
kinetic energy of the hydrogen molecules.
B The mean kinetic energy of the helium molecules is less than the mean kinetic
energy of the hydrogen molecules.
C The mean square velocity of the helium molecules is greater than the mean
square velocity of the hydrogen molecules.
D The mean square velocity of the helium molecules is less than the mean square
velocity of the hydrogen molecules.
(Total for Question 8 = 1 mark)
4
*P75599A0432*
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