Chapter 15
Superposition
Outlines
1.
Stationary waves
2.
Diffraction
3.
Interference, two source
Interference
4.
Diffraction gratings
5.
Electromagnetic spectrum
6.
Production and use of
ultrasound in diagnosis
Superposition
When two waves overlap the res
Chapter 14
Waves
Outlines
1.
Progressive waves
2.
Transverse and longitudinal
waves
3.
Determination of frequency and
wavelength of sound waves
4.
Doppler effect
5.
Electromagnetic spectrum
6.
Production and use of
ultrasound in diagnosis
A Level
Vibratio
Revision
SI Base Quantities and Units
* Luminous intensity not in the Cambridge A-level syllabus
Derived Quantities and Base Units
Quantity
Unit
Derived unit
Frequency
hertz (Hz)
s-1
Speed
m s-1
m s-1
Acceleration
m s-2
m s-2
Force
newton (N)
kg m s-2
Ene
Chapter 20
D.C. circuits
Outlines
1.
2.
3.
Practical circuits
Kirchhoffs laws
Potential dividers
Names of electrical components and their circuit symbols
Electromotive force (EMF)
In any circuit there are components that put
energy in and those that take
Force Questions
8.
The London Eye is a large wheel which rotates at a slow steady speed in a vertical plane about
a fixed horizontal axis. A total of 800 passengers can ride in 32 capsules equally spaced around
the rim.
A simplified diagram is shown below
8.
Calculation of how long wheel takes to complete one revolution:
Time = 2 60 m/0.20 m s1 (1)
= 1900 s/1884 s/31.4 min (1)
2
Change in passengers velocity:
Direction changes OR up (N) down (S) OR + (1)
OR 180 (1)
2
0.40 m s1
[0.40 m s1 without direction
Marking scheme: Practical circuits
1
C
[1]
C
[1]
2
D
4
A
3
5
6
D
a
[1]
[1]
[1]
E I (R + r)
R 0 (since supply is shorted-out) so
12
5.2 A
2.3
b Excessive heating of the power supply.
I
7
a
p.d. across internal resistance 0.65 V
r
Vout
V
9
E
r
p.d. across
Data
speed of light in free space,
permeability of free space,
permittivity of free space,
elementary charge,
the Planck constant,
unified atomic mass constant,
rest mass of electron,
rest mass of proton,
molar gas constant,
the Avogadro constant,
the Bol
Marking scheme: electric field
2007 M/J P1 Q 28
D
2007 Oct/Nov P1 Q27
D
2008 Oct/Nov P1 Q29
B
2010 M/J P11 Q27
A
2007 Oct/Nov P1 Q40
A
2008 Oct/Nov P1 Q13
A
2007 M/J P1 Q30
A
2008 Oct/Nov P1 Q30
A
2010 M/J P21 Q5
Motion of a charge in a uniform electric f
Marking scheme: Resistance and resistivity
1
B
[1]
3
B
[1]
2
4
5
6
7
8
9
D
[1]
C
[1]
C
a The current is not directly proportional to the p.d., therefore it does not obey Ohms law.
b V 4.0 V and I 60 mA
V
R
I
4.0
R
67
0.060
c The resistance of the lamp i
Forces
1
Two forces, each of magnitude 8 N, act on an object. The angle between the two forces is 60.
What is the magnitude of the resultant force acting on the object?
A
B
C
D
2
The object in the diagram is in equilibrium.
Which equation is correct about
Forces and moments
1
A ship is pulled at a constant speed by two small boats A and B, as shown in the diagram. The
engine of the ship does not produce any force.
The tension in each cable between A and B and the ship is 4000 N.
a. Draw a free-body diagram
Marking scheme: Current of electricity
1 B
[1]
3 A
[1]
5 D
[1]
2 D
[1]
4 A
[1]
6 D
[1]
7 Q I t
Q 1.2 (3.0 60)
Q 216 C 220 C
8 I
9 a
Q 3.8 103
=
= 3.16 105 A 3.2 105 A (or 32 A)
t
120
V
6.0
I 0.023
R 260
R
1.0
1.7
0.60
3.5
RB
5.8
0.60
W
11 V
Q
15
V
Marking scheme: Work, energy and power
1
C
[1]
2
D
[1]
3
C
[1]
4
A
[1]
5
D
[1]
6
Meteor: E k
7
1
1
mv 2 0.010 50002 1.3 105 J
2
2
1
1
Jogger: E k mv 2 65 5.0 2 810 J
2
2
The meteor has greater kinetic energy than the jogger.
a
b
8
a
a
b
c
[1]
[1]
Ep mgh
Marking scheme: Electric field
1 B
[1]
2 C
[1]
3 D
[1]
4 D
[1]
5 B
[1]
6 The two units are: V m1
and N C1.
[1]
[1]
F
1.5 10 3
Q
5.0 10 8
E 3.0 104 V m1
7 E
8 F EQ 5.0 105 3.2 1019
F 1.6 1013 N
V
600
d
3.0 10 2
E 2.0 104 V m1
The field acts towards the neg