AQA AS PHYSICS
PAPER 1 7407 QP
2021
*jun*
IB/M/Jun21/E7 7407/1
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
TOTAL
Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
• a pencil and a ruler
• a scientific calculator
• a Data and Formulae Booklet
�...
Candidate signature
I declare this is my own work.
AS
PHYSICS
Paper 1
Time allowed: 1 hour 30 minutes
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
• a protractor. 2
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
outside the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of TOTAL
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 70.
• You are expected to use a scientific calculator where appropriate.
• A Data and Formulae Booklet is provided as a loose insert.
*jun217407101*
IB/M/Jun21/E7 7407/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 . 1 Identify the number of neutrons in a nucleus of polonium-210 ( 21084 Po) .
Tick () one box.
[1 mark]
84
126
210
294
0 1 . 2 A polonium-210 nucleus is formed when a stationary nucleus of bismuth-210 decays.
A beta-minus (β−) particle is emitted in this decay.
Outline, with reference to β− decay, why bismuth-210 and polonium-210 have different
proton numbers.
[2 marks]
*02* IB/M/Jun21/7407/1
, 3
Do not write
outside the
The kinetic energies of β− particles emitted from a sample of bismuth-210 are box
analysed. These β− particles have a range of kinetic energies.
The total energy released when each nucleus of bismuth-210 decays to a
nucleus of polonium-210 is 1.2 MeV.
Figure 1 shows the variation with Ek of the number of β− particles that have the kinetic
energy Ek.
Figure 1
0 1 . 3 Explain how the data in Figure 1 support the hypothesis that a third particle is
produced during β− decay.
[2 marks]
Question 1 continues on the next page
Turn over â–º
*03* IB/M/Jun21/7407/1
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