Download AQA PHY1 PRACTICE PAPER RD1 (1¼ Hrs)

AQA PHY1 PRACTICE PAPER RD1
1.
(1¼ Hrs)
An alternating current (a.c.) source is connected to a resistor to form a complete circuit. The trace obtained
on an oscilloscope connected across the resistor is shown.
The oscilloscope settings are: Y sensitivity 4.0V per division, time base 1.0 ms per division.
i.
Determine the peak voltage of the a.c. source.
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ii.
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Hence calculate the r.m.s. voltage.
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iii.
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Determine the time period of the a.c. signal.
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iv.
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Hence calculate the frequency of the a.c. signal.
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[Total 4 marks]
2.
(a)
An ion of plutonium
239
94 Pu
has an overall charge of +1.6 × 10–19C.
For this ion state the number of
i.
Protons ......................................
ii.
Neutrons ................................................
iii.
Electrons ..................................
(b) Plutonium has several isotopes. Explain the meaning of the word isotopes.
[3]
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[Total 5 marks]
AQA PHY1 Practice Paper RD1
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3.
(a)
State what happens in an atom when line spectra are produced.
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(b)
The diagram below represents some energy levels of the lithium atom.
energy levels of lithium
A
energy/eV
0.0
–1.0
B
C
–2.0
–3.0
D
–4.0
–5.0
ground state E
–6.0
i.
Calculate the ionisation energy, in J, of the lithium atom.
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ii.
An excited lithium atom may emit radiation of wavelength 6.1 × 10–7m.
Show that the frequency of this radiation is approximately 5.0 × 1014Hz.
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iii.
Calculate the energy, in J, of each photon of this radiation.
AQA PHY1 Practice Paper RD1
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iv.
Draw, on the diagram, an arrow between two energy levels which shows the transition
responsible for the emission of a photon of energy 2.0 eV.
v.
Two transitions emit radiation of similar frequencies. One of them is the transition between
B and D. What is the other?
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vi.
A transition between which two levels would give radiation of the longest possible
wavelength?
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[Total 11 marks]
4.
(a)
There are a number of ways in which u, d and s quarks and their associated antiparticles may be
combined to form mesons. Use the table ‘properties of quarks’, in the Data Sheet, to complete parts
(i) to (iii).
(i)
The kaon K– has a strangeness –1. Write down its quark composition.
K– ...........................................................................................................................................
(ii)
The kaons K0 and K+ both have strangeness +1. Write down their quark composition.
K0 .............................................................................................................................................
K+ ...........................................................................................................................................
(iii)
Write down the quark composition of a proton.
p ..........................................................................................................................................[5]
(b)
In the strong interaction,
K–
+
p

K0
+
K+
+
X,
deduce the quark composition of, and state the type of, hadron represented by X.
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(c)
A positive muon may decay to a positron and two neutrinos. Write down an equation
representing the muon decay.
+

AQA PHY1 Practice Paper RD1
2]
[Total 9 marks]
3
5.
(a)
A positron is emitted from a nucleus when a proton changes to a neutron in the nucleus. The
Feynman diagram for this process is shown in the figure below.
Identify the particles labelled A, B, C and D in the diagram.
C
D
A
B
up quark
particle A ................................................
particle B ..................................................
particle C ................................................
particle D ................................................
(b)
Name an exchange particle of the weak nuclear force.
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(c)
State one difference between the photon and the exchange particle of the weak nuclear force.
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[Total 6 marks]
6.
(a)
(i)
Give the equation which relates the electrical resistivity of a conducting material to its
resistance. Define the symbols in the equation.
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(ii)
A potential difference of 1.5 V exists across the ends of a copper wire of length 2.0 m and
uniform radius 0.40 mm. Calculate the current in the wire.
resistivity of copper = 1.7 × 10–8  m
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AQA PHY1 Practice Paper RD1
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(b) In the circuit shown, each resistor has the same resistance. The battery has an e.m.f. of 12 V
and negligible internal resistance.
A
12 V
C
B
(i)
Calculate the potential difference between A and B.
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(ii)
Calculate the potential difference between B and C.
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(iii)
A high resistance voltmeter is connected between A and C. What is the reading on the
voltmeter?
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[Total 10 marks]
7.
Two resistors, A and B, have different resistances but otherwise have identical physical properties.
E is a cell of negligible internal resistance.
E
E
A
A
B
B
figure 1
figure 2
When the resistors are connected in the circuit shown in figure 1, A reaches a higher temperature than B.
When connected in the circuit shown in figure 2, B reaches a higher temperature than A.
[see next page]
AQA PHY1 Practice Paper RD1
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Explain these observations fully, stating which resistance is greater.
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[Total 6 marks]
8.
(a)
Draw, on the axes below, the current/voltage characteristic for a filament lamp.
Do not insert any values for current or voltage.
current
0
voltage
(3)
(b)
Explain why the characteristic has the shape you have drawn.
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(c)
The current/voltage characteristic of a filament lamp is to be determined using a datalogger, the
data then being fed into a computer to give a visual display of the characteristic. Draw the circuit
diagram required for such an experiment, and state what is varied so as to produce a range of
values. [ space on next page]
AQA PHY1 Practice Paper RD1
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(Total 11 marks)
9.
Electrons travelling at a speed of 5.00 × 105 m s–1 exhibit wave properties.
(a)
What phenomenon can be used to demonstrate the wave properties of electrons? Details of any
apparatus used are not required.
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(b)
Calculate the wavelength of these electrons.
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(c)
Calculate the speed of muons with the same wavelength as these electrons.
Mass of muon = 207 × mass of electron
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(d)
Both electrons and muons were accelerated from rest by the same potential difference. Explain why
they have different wavelengths.
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[Total 8 marks]
[Paper Total 70 marks
AQA PHY1 Practice Paper RD1
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