JAMES RUSE AGRICULTURAL HIGH SCHOOL
2010
HIGHER SCHOOL CERTIFICATE EXAMINATION
ASSESSMENT TASK 3
TERM 2
PHYSICS
Theory
Total marks – 35
General Instructions
Reading time – 5 minutes
Working time – 50 minutes
Write using black or blue pen
Draw diagrams using pencil
Board-approved calculators may be used
A data sheet, formulae sheets and Periodic Table are provided
Write your Student Number at the top of page 7.
JRAHS Physics 2010 Assessment Task 3 Theory 1
SECTION 1 Pages 2 – 5
Part A – 11 marks
Attempt Questions 1-11
1. The energy level diagram for the hydrogen atom is shown.
During which of the following energy state changes of the hydrogen atom is the photon with
the most energy emitted?
(A) n = 5 directly to n = 2
(B) n = 4 directly to n = 2
(C) n = 2 directly to n = 1
(D) n = 1 directly to n = 5
2. Which of the following ideas of 19th century electromagnetic theory was challenged by the
Rutherford-Bohr model of the atom?
(A) In a vacuum all forms of electromagnetic radiation travel at the speed of light.
(B) Light may be regarded as electric and magnetic fields.
(C) Light travels at slower speeds through substances than through a vacuum.
(D) Whenever a charge is accelerating, electromagnetic radiation is produced.
JRAHS Physics 2010 Assessment Task 3 Theory 2
3. What property of atoms was identified using the following setup by early 20th century
scientists?
(A) The presence of x-rays originating from alpha particles.
(B) Identify that the nucleus was emitting alpha particles.
(C) The nucleus was a positive charged body.
(D) The nucleus was a large solid particle.
4. When a gas was excited while in a magnetic field, the emission spectrum produced shows a
splitting of the spectral lines. Which ‘model’ explained this?
(A) The existence of hyperfine spectral lines.
(B) The Zeeman effect.
(C) Heisenberg principle.
(D) Bohr postulate.
5. If the velocity of an electron is given as 2.3 × 10-5 ms-1, then what is its wavelength?
(A) λ = 3.16 x 10-9 m
(B) λ = 7.27 x 10-4 m
(C) λ = 3.16 x 103 m
(D) λ = 0.00316 m
JRAHS Physics 2010 Assessment Task 3 Theory 3
6. In which invention has the concept of quanta, or packets of light energy called photons, found
greatest application?
(A) X ray crystallography.
(B) computer chip
(C) maglev train
(D) solar cell
7. Which statement is true about the photoelectric effect?
(A) If dim light of a given frequency does not result in a photocurrent, then increasing its
brightness will increase the likelihood of a photocurrent being produced.
(B) If dim light of a given frequency produces a photocurrent. then increasing its brightness
will have no effect on the amount of photocurrent produced.
(C) If dim light of a given frequency produces a photocurrent then increasing its brightness will
is also likely to increase the photocurrent produced.
(D) If light of a given frequency does not result in a photocurrent, then lowering the frequency
will increase the likelihood of a producing a photocurrent.
8. The labels have been rearranged on these energy diagrams. Which diagram is labelled
correctly?
(A) A
(B) B
(C) C
(D) D
JRAHS Physics 2010 Assessment Task 3 Theory 4
9. Which statement about superconductors is correct?
(A) Some pure metals when cooled to the critical temperature can become superconductors.
(B) Phonons are produced by electrons joining up to form Cooper pairs.
(C) The individual electrons involved in a Cooper pair remain together while the critical
temperature is maintained.
(D) BCS theory is used to explain the behaviour of Type II superconductors.
10. This diagram shows the apparatus used during early experiments in the late 19th century.
Which scientist most likely used this apparatus?
(A) Hertz
(B) Einstein
(C) Planck
(D) Heisenberg
11. The diagram shows a rare earth magnet levitating
above a piece of YBCO superconducting material,
immersed in liquid nitrogen.
Which one of the following is the best explanation for this levitation?
(A) The liquid nitrogen vapour uplift is greater than gravitational force.
(B) Eddy currents have been generated in the rare earth magnet and the YBCO material.
(C) Eddy currents have been generated in the YBCO material.
(D) Cooling by contact with the liquid nitrogen eliminates crystal vibration in the magnet.
JRAHS Physics 2010 Assessment Task 3 Theory 5
Student Number ……………………
Section I Mark ----- /11
Part A
Multiple Choice Answer Sheet
1. A B C D
2. A B C D
3. A B C D
4. A B C D
5. A B C D
6. A B C D
7. A B C D
8. A B C D
9. A B C D
10. A B C D
11. A B C D
JRAHS Physics 2010 Assessment Task 3 Theory 6
Part B – 24 Marks
Attempt Questions 12 – 17
Question 12 (5marks) Marks
The diagram shows two electronic components labelled A and B. The components shown
in the diagram have not been scaled up or down, they are both shown full size.
(a) Identify which of these components is a solid state and which is a thermionic device. 1
A = ………………………………… B = ……………………………………
(b) Describe four differences between solid state and thermionic devices. 4
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
JRAHS Physics 2010 Assessment Task 3 Theory 7
Question 13 (3marks)
The diagram shows an early ‘doping’ method used to construct transistors, where two pellets of
Indium were simply melted into a piece of n- type semiconductor. This converted small regions of
the n- type semiconductor into regions of p- type semiconductor.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
Describe how ‘doping’ a semiconductor can change its electrical properties.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
JRAHS Physics 2010 Assessment Task 3 Theory 8
Question 14 (7 marks) Marks
Planck set up equipment similar to that shown in the diagram below, to investigate the
photoelectric effect.
(a) Sections of the diagram have been erased. Complete and label the diagram to show 2
how Planck would have set up the equipment to measure the stopping voltage for
red light.
(b) Given the wavelength of this red light is 650 nm, find the energy of a photon for this 2
red light in eV.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
Question 14 continued on next page
JRAHS Physics 2010 Assessment Task 3 Theory 9
Marks
(c) Given the work function for copper metal is 4.7 eV, discuss whether the red light 2
will be able to eject photoelectrons from a copper surface.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
(d) Do either (i) or (ii)
(i) If you decided, in part (c) above, that photoelectrons would be emitted, 1
calculate their kinetic energy.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
Or:
(ii) If you decided, in part (c) above, that photoelectrons would not be emitted, 1
calculate the threshold frequency of light required to just release electrons from
a copper surface.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
JRAHS Physics 2010 Assessment Task 3 Theory 10
Question 15 (1mark)
If electrons in hydrogen atoms obeyed the rules of classical mechanics instead of those of Bohr’s
quantum mechanics model, describe what type of spectra would be produced.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
Question 16 (4 marks)
Describe de Broglie’s proposal and explain how this proposal was confirmed by Davisson and
Germer.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
JRAHS Physics 2010 Assessment Task 3 Theory 11
Question 17 (4marks)
Outline the limitations of the Bohr model of the hydrogen atom.
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
………………………………………………………………………………………………………
End of Task
JRAHS Physics 2010 Assessment Task 3 Theory 12
