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External Examination 2014
ATTACH SACE REGISTRATION NUMBER LABEL TO THIS BOX
FOR OFFICE USE ONLY SUPERVISOR CHECK
RE-MARKED Tuesday 4 November: 1.30 p.m. Time: 3 hours
Part 1 of Section A
Examination material: Question Booklet 1 (26 pages) Question Booklet 2 (22 pages) Question Booklet 3 (8 pages) one SACE registration number label
Approved dictionaries and calculators may be used.
Instructions to Students
- You will have 10 minutes to read the paper. You must not write in your question booklets or use a calculator during this reading time but you may make notes on the scribbling paper provided.
- This paper is in two sections: Section A is divided between Question Booklet 1 and Question Booklet 2; Section B is in Question Booklet 3. Section A (Questions 1 to 25) This section consists of questions of different types (e.g. short-answer, graphical interpretation, and data and practical skills). Answer Part 1 of Section A (Questions 1 to 14) in the spaces provided in Question Booklet 1. Write on page 26 of Question Booklet 1 if you need more space to finish your answers. Answer Part 2 of Section A (Questions 15 to 25) in the spaces provided in Question Booklet 2. Write on page 22 of Question Booklet 2 if you need more space to finish your answers. Section B (Questions 26 and 27) This section consists of two extended-response questions. Answer Section B in the spaces provided in Question Booklet 3. Write on page 8 of Question Booklet 3 if you need more space to finish your answers.
- The allocation of marks and the suggested allotment of time are: Section A Part 1 76 marks 75 minutes Part 2 74 marks 75 minutes Section B 30 marks 30 minutes Total 180 marks 180 minutes
- The equation sheet is on pages 3 and 4, which you may remove from this booklet.
- Vector quantities in this paper are indicated by arrows over the symbols.
- Marks may be deducted if you do not clearly show all steps in the solution of problems, if you give answers with an inappropriate number of significant figures or with incorrect units, or if you do not define additional symbols. You should use diagrams where appropriate in your answers.
- Use only black or blue pens for all work other than graphs and diagrams, for which you may use a sharp dark pencil.
- Attach your SACE registration number label to the box at the top of this page. Copy the information from your SACE registration number label into the boxes on the front covers of Question Booklet 2 and Question Booklet 3.
- At the end of the examination, place Question Booklet 2 and Question Booklet 3 inside the back cover of this question booklet.
2014 PHYSICS
QUESTION
BOOKLET
26 pages, 14 questions
2
STUDENT’S DECLARATION ON THE USE OF
CALCULATORS
By signing the examination attendance roll I declare that:
- my calculators have been cleared of all memory
- no external storage media are in use on these calculators.
I understand that if I do not comply with the above conditions for the use of calculators I will:
- be in breach of the rules
- have my results for the examination cancelled or amended
- be liable to such further penalty, whether by exclusion from future examinations or otherwise, as the SACE Board of South Australia determines.
4
Section 2: Electricity and Magnetism
F
q q r
1 2 SH^2 r q
= distance between charges q 1 and 2
F = I ' lB sin T T = angle between field and current element
G
G
B
I ' l G
G
E
F
= (^) q F = qvB sin T T = angle between field and velocity
G
G
B
v
E q r
4 SH 0 2
r mv qB
= r = radius of circle
W = q V ' T
m qB
2 S
E
V
d
' d = distance between parallel plates
K
q B r m
2 2 2
2
Section 3: Light and Matter
v = f O v = speed of light E = hf E = energy of photon
d sin T = m O d = distance between slits p h = O T = angular position of m th maximum K (^) max = hf − W W = work function of the metal m = integer (^) ( 0 1 2, , ,!)
' y
L
d
O (^) ' y = distance between adjacent minima or maxima
W = hf 0 f 0 = threshold frequency
f
e V max (^) h
' ' V = potential difference across the tube
L = slit-to-screen distance
d N
N = number of slits per metre of grating
Section 4: Atoms and Nuclei
E (^) n − E (^) m = hf En − Em = energy difference E = mc^2 E = energy
A = Z + N A
N
=
mass number atomic number number of neutrons
Z
TABLE OF PREFIXES
Refer to the following table when answering questions that involve the conversion of units:
Pre¿x Symbol Value tera (^) T 1012 giga G 10 9 mega (^) M 10 6 kilo k 10 3 centi c 10 ^2 milli (^) m 10 ^3 micro P 10 ^6 nano n 10 ^9 pico p 10 ^12
5 PLEASE TURN OVER
SECTION A
PART 1 (Questions 1 to 14) (76 marks)
Answer all questions in this part in the spaces provided.
- The bicycle shown in the photograph below has safety reflectors on its wheels. Each wheel is undergoing uniform circular motion.
reflector
Source : © Strixcode|Dreamstime.com (adapted)
Explain why the reflectors are accelerating even though they are travelling at a constant speed.
_________________________________________________________________________________________________ (2 marks)
7 PLEASE TURN OVER
(c) Calculate the horizontal distance travelled by the arrow.
____________________________________________________________________________________________ (2 marks)
(d) Identify the range of angles that would give a greater horizontal distance for the same initial speed.
____________________________________________________________________________________________ (2 marks)
8
- The motion of a satellite such as the International Space Station (shown below) can be used to obtain a value for the mass of the Earth.
Source : © iStockphoto.com|scibak
(a) The International Space Station completes circular orbits of the Earth with a speed of 7.6 10 3 m s^1 at a radius of 6.8 10 6 m. Determine the mass of the Earth.
____________________________________________________________________________________________ (3 marks)
10
- The Magellan spacecraft used microwaves to survey, and create maps of, the surface of the planet Venus.
(a) Venus is covered with a thick layer of cloud. Technology similar to the laser airborne depth sounder (LADS) was used by Magellan to project microwave pulses downwards, so that they reflected normally off the bottom surface of the layer of cloud and off the surface of Venus. The time difference between the reflected microwave pulses was recorded. The diagram below shows the paths of the reflected microwave pulses:
bottom surface of layer of cloud
surface of Venus
[ This diagram is not drawn to scale. ]
At a particular location, the two reflected microwave pulses were recorded returning to Magellan with a time difference of 2.36 10 ^4 s. The speed of the microwave pulses that reflected off the surface of Venus was 2.98 10 8 m s^1. Determine the distance between the bottom surface of the layer of cloud and the surface of Venus.
____________________________________________________________________________________________ (3 marks)
11 PLEASE TURN OVER
(b) Magellan was put into a circular polar orbit around Venus, with a period of 5.64 10 3 s.
(i) Explain why a polar orbit was used for surveying the surface of Venus.
_______________________________________________________________________________________ (2 marks)
(ii) Using v
r
T
2 S
and v
GM
r
= , derive r
GM
= T
3 2
2 S
, the relationship between r the radius
of the orbit and T the period of rotation for a satellite orbiting Venus. M represents the
mass of Venus.
_______________________________________________________________________________________ (2 marks)
(iii) Using the equation from part (ii), calculate the radius of Magellan ’s orbit. The mass of Venus is 4.87 10 24 kg.
_______________________________________________________________________________________ (3 marks)
13 PLEASE TURN OVER
- An electron in a hydrogen atom orbits a proton at a radius of 5.29 10 ^11 m.
Determine the magnitude of the electric field E created by the proton at the radius at which the
electron orbits.
_________________________________________________________________________________________________ (2 marks)
14
- (a) The diagram below shows a positively charged conductor with a sharp point near a neutral metal plate:
On the diagram above , sketch the electric field between the conductor and the metal plate. (3 marks)
16
- A Teltron tube is a device used to accelerate electrons, as shown in the photograph below.
Electrons are deflected when they enter the region between two parallel plates to which a potential difference has been applied.
Explain why electrons will experience an electric force of constant magnitude when they are between two very long parallel plates to which a constant potential difference has been applied.
_________________________________________________________________________________________________ (2 marks)
17 PLEASE TURN OVER
9. The diagram below shows point A , which is midway between conductor 1 and conductor 2.
In conductor 1 there is a current I , which is directed towards the bottom of the page. A current
of the same magnitude flows in conductor 2.
conductor 1 conductor 2
A
I
Determine the direction of the current in conductor 2 that will cause the total magnetic field at
point A to be zero.
Justify your answer.
_________________________________________________________________________________________________ (3 marks)
19 PLEASE TURN OVER
(b) The kinetic energy of an ion as it leaves a cyclotron does not depend on the potential difference between the dees.
(i) Explain why the ion gains kinetic energy each time it moves across the gap between the dees.
_______________________________________________________________________________________ (2 marks)
(ii) Explain why increasing the potential difference between the dees has no effect on the kinetic energy of the ion as it leaves the cyclotron.
_______________________________________________________________________________________ (3 marks)
20
- An experiment was conducted to investigate the force on a current-carrying conductor in a magnetic field. The diagram below shows the conductor in the magnetic field of magnitude
B 0.30 T, which is directed to the right of the page:
ș
B
[ This diagram is not drawn to scale. ]
(a) The length of the conductor in the magnetic field was 0.55 m. A current of 0.050 A flowed
through the conductor, causing it to experience a force directed into the page. The magnitude of the force was measured to be 3.8 10 ^3 N.
(i) Determine the direction in which the current flowed through the conductor, and indicate the direction on the diagram above. (1 mark)
(ii) Determine the angle θ between the conductor and the magnetic field.
_______________________________________________________________________________________ (3 marks)
