Are you wondering what will be in this year’s HSC Physics Exam?
Like other Year 12 Physics students, you’ve probably been frustrated by the lack of past HSC Physics exam papers available to guide your preparation for the upcoming HSC Physics Exam.
However, there is an advantage of the being the first cohort for sitting the HSC Physics Exam based on the new syllabus:
The exam questions are going to be a lot more predictable than you think.
Let’s examine the new HSC Physics topics introduced and the new HSC Physics exam questions that are likely to appear in this year’s HSC Physics Exam.
In this article, we’re going to discuss:
New Topics introduced in 2019 HSC Physics Syllabus
2019 HSC Physics syllabus introduced new topics over the four modules (Modules 5 – 8). Understanding the new changes will ensure that you are not misguided by the previous HSC exam questions based on the old syllabus.
Module 5 Advanced Mechanics
New topics introduced in ‘Module 5 Advanced Mechanics’ in the new 2019 syllabus are outlined below:
New topics introduced the 2019 HSC Physics Syllabus 
New Topics  Key Concepts  HSC Physics Question Types 
Circular Motion  Uniform circular motion in the horizontal and vertical planes  Quantitative analysis of: Car on banked track with no friction
 The conical pendulum
 A spinning wheel or disc
 Ferris wheel

Non uniform circular motion  Quantitative and qualitative analysis of Loopdeloop maneuver 
Kepler’s Laws  Kepler’s first and second laws  Qualitative analysis of motion of objects in terms of Kepler’s first and second laws. 
Energy of orbits  Energy of a satellite in orbit  Quantitative analysis of: Total energy of a satellite in orbit
 Work required to go into orbit
 Energy required to change orbits

Module 6: Electromagnetism
New topics introduced in ‘Module 6 Electromagnetism’ from the new 2019 HSC Physics syllabus are outlined below:
New topics introduced the 2019 HSC Physics Syllabus 
Topic  Key Concept  HSC Physics Question Types 
Magnetic field  Magnetic field produced by a conductor   Quantitative analysis of magnetic field produced by a long straight current carrying conductor
 Quantitative analysis of magnetic field produced by a solenoid

Electromagnetic Induction  Faraday’s Law of electromagnetic induction   Quantitative analysis of induced emf from a change in magnetic flux

Module 7: The Nature of Light
The new topics introduced in ‘Module 7 The Nature of Light’ in the new 2019 HSC Physics syllabus are outlined below:
New topics introduced the 2019 HSC Physics Syllabus 
New Topics  Key Concepts  HSC Physics Question Types 
Wave Model of Light  Thomas Young’s double slit experiment   Hugyens’ wave model vs Newton’s particle model of light
 Qualitative & quantitative analysis of Thomas Young’s double slit experiment

Polarisation of transverse waves  Using Malus’s Law to calculate the intensity of polarised light 
Measurements of the Speed of Light  Types of measurements of speed of light   Astronomical measurements
 Time of flight measurements

Spectroscopy  Atomic & Stellar Spectra   Spectra of elements and compounds
 Qualitative analysis of different light sources
 Spectra of stars
 Doppler shift & translations velocity of star
 Doppler broadening & rotational velocity of star
 Pressure broadening & density of gas

Special Relativity  Relativistic momentum and mass dilation   Quantitative analysis of relativistic momentum and mass dilation
 Explaining the consequences of mass dilation

Module 8: From the Universe to the Atom
The new topics introduced in ‘Module 8 From the Universe to the Atom’ in the new 2019 HSC Physics syllabus are outlined below:
New topics introduced in the 2019 HSC Physics Syllabus 
New Topics  Key Concepts  HSC Physics Question Types 
Millikan’s oil drop experiment  Charge of an electron  Qualitative and quantitative analysis of the results of the oil drop experiment 
Schrodinger’s contribution  Schrodinger’s equation and the model of the atom  Discussing Schrodinger’s contribution to atomic theory 
Nuclear stability and decay  Half life and activity   Quantitative analysis of a sample of radioactive substance
 Half life and radioactive decay constant

Expansion of the universe  Cepheid variable stars and Hubble’s law   Discussing the significance of Cepheid variable stars in cosmology
 Describing the process for discovering the expansion of the universe by Edwin Hubble

The Big Bang Theory  Evolution of the universe   Describing the evidence for the Big Bang
 Describing the process of accretion of stars and galaxies

Classification of stars  HertzsprungRussell diagrams   Describing the relationship between the mass of stars and their luminosities and lifetime.
 Comparing the energy production processes of Main Sequence stars and Red Giants or White Dwarfs

Stellar evolution  Evolutionary stages for a star   Explaining the initial stage of formation of a star
 Explaining the evolutionary stages for a star with 1 3 solar mass

New HSC Physics Exam Questions on ‘Advanced Mechanics’
Question 1: Conical Pendulum
In a conical pendulum, a bob of mass 100 g is attached to a fixed point by a string of length 0.5 m and is rotating with constant speed in a horizontal circle of radius 0.3 m.
(a)  Show that the acceleration of the bob is given by a = gtan\theta  2 marks 
(b)  Calculate the angular speed of the bob. Express your answer to two significant figures.  3 marks 
(c)  Hence or otherwise, calculate the centripetal force acting on the bob. Express your answer to two significant figures  2 marks 
See Question 1 solution.
Question 2: Banked Track
A moving cyclist is perpendicular to a banked circular track which is 40° from horizontal, as pictured below:
The cyclist is travelling around the circular track at a radius of 20 m.
(a)  Find the components of force on the cyclist and relate these to centripetal force on the cyclist.  2 marks 
(b)  Use the equations in part (a) to derive an expression for the speed of the cyclist and calculate the speed of the cyclist.  3 marks 
See Question 2 solution.
Question 3: Ferris wheel
The London Eye is the fourth largest Ferris wheel in the world. The wheel has a radius of 135 m and rotates once every 30 minutes. Each of the 32 capsules has a mass of 32 tonnes. A schematic representation of the London Eye is shown below.
(a)  Compare qualitatively the speed of carriage A, B and C.  1 mark 
(b)  Calculate the centripetal acceleration.  2 marks 
(c)  Calculate the force that needs to be applied to the carriage at C to keep it rotating.  2 marks 
(d)  Comment on how the magnitude of the force in (c) change compared to when the Ferris wheel is stationary.  1 mark 
See Question 3 solution.
Question 4: Nonuniform circular motion
NASA takes its astronauts to zero gravity flights using Boeing 727 jets. The aircraft gives its passengers the sensation of weightlessness by following a parabolic flight path at an altitude of 10 000 m above the Earth’s surface.
At the top of the flight, the trajectory can be modelled as an arc of a circle. A typical trajectory is shown in the diagram below.
(a)  Calculate the radius of the arc that would give passengers zero gravity at the top of the flight if the jet is travelling at 180 \ ms^{1} . Show your working  2 marks 
(b)  Is the force of gravity on a passenger zero at the top of the flight? Explain what ‘zero gravity experience’ means  3 marks 
See Question 4 solution.
Question 5: Kepler’s Second Law
The orbit of Halley’s comet is shown below.
(a)  At which position is Halley’s comet moving the slowest? Give a reason for your answer.  2 marks 
(b)  Explain how the motion of the Halley’s comet in its orbit supports Kepler’s second law.  3 marks 
See Question 5 solution.
New HSC Physics Exam Questions on ‘Electromagnetism’
Question 6: Magnetic field strength of a solenoid
Two identical solenoids are positioned in a line as shown below. A current of 2 A flows through the coils and produces magnetic fields.
Ignore the effects of Earth’s magnetic fields.
(a)  Sketch at least four field lines in the space enclosed by the dotted line. Clearly indicate the direction of each field line.  2 marks 
(b)  Calculate the magnetic field strength produced by each solenoid. N = 6 turns
 I = 2 A
 L = 20 cm
 2 marks 
See Question 6 solution.
Question 7: Electromagnetic induction
A rigid metal rod AB is mounted on a rotating stand on a horizontal table. The rod rotates in a horizontal circle at constant speed in uniform magnetic field directed downward as shown in the diagram.
(a)  Which end of the rod is negative?  1 mark 
(b)  Explain how the EMF is produced in the rod.  3 marks 
(c)  Sketch a graph of induced emf versus time for two rotations.  2 marks 
See Question 7 solution.
Question 8: Quantitative analysis of Faraday’s Law of electromagnetism
A circular coil of 100 turns with a radius of 2.0 cm is placed in a changing magnetic field. The angle between the magnetic field lines and the plane of the coil is 90 degrees. The graph below shows the variation with time of the magnetic field strength.
(a)  From the graph, calculate the change in magnetic flux experienced by the coil over the 1 second period.  2 marks 
(b)  Calculate the magnitude of the induced emf in the coil.  2 marks 
See Question 8 solution.
Related: Additional Module 6 Practice Questions
New HSC Physics Exam Questions on ‘The Nature of Light’
Question 9: Thomas Young’s Double Slit Experiment
An experimental setup to demonstrate Young’s double slit experiment is shown below.
A pattern of bright and dark bands is observed on the screen. Explain two changes that will increase the distance, Δx, between dark bands in this double slit interference pattern. (3 marks)
See Question 9 solution.
Question 10: Polarisation of transverse waves
An unpolarised beam of light passes through a series of polarisers as shown below.
Calculate the ratio of the intensities of the transmitted light, I_{C }to I_{A. }(2 marks).
See Question 10 solution.
Question 11: Time of flight measurements
In the 1840s, French physicist, Hippolyte Fizeau performed an experiment to measure the speed of light.
Describe the method he used to determine the speed of light. You may use a diagram to assist your answer. (4 marks)
See Question 11 solution.
Question 12: Spectra of different light sources
The spectra of light from two different light sources are shown in the diagram below. The dashed lines indicate the range of visible wavelengths.
 
Spectrum A  Spectrum B 
Four possible light sources are listed below:
 Blue laser light
 Mercury vapour lamp (discharge tube filled with Mercury vapour)
 100 W incandescent globe
 Sunlight
Identify the light source for Spectrum A & B. Give reason for your answer. (4 marks)
See Question 12 solution.
Question 13: Spectra of stars
The diagram below shows absorption spectra of a certain element from a discharge tube and two stars, A and B. Stars A and B are known to be stationary in space relative to the Earth.
(a)  Outline the rotational motion of each star, giving reasons for your answer.  2 marks 
(b)  Outline how the Doppler effect gives information about the translational motion of a star.  2 marks 
See Question 13 solution.
Question 14: HafeleKeating experiment
The HafeleKeating experiment is a famous experiment where three atomic clocks were synchronised and two were then flown around the world – one with the Earth’s rotation, and one in the opposite direction – while the third remained on the ground.
(a)  State the results of the experiment.  2 marks 
(b)  Outline how the results from this experiment support the theory of Special Relativity.  3 marks 
See Question 14 solution.
New HSC Physics Exam Questions on ‘From the Universe to the Atom’
Question 15: Millikan’s oil drop experiment
Millikan and Fletcher’s determined the charge of an oil drop.
(a)  Outline how the charge was measured.  3 marks 
(b)  State the conclusion of their experiment  1 mark 
See Question 15 solution.
Question 16: Schrodinger’s contributions to atomic theory
Describe how contributions to atomic theory made by Schrodinger changed the de BroglieBohr model of the atom. (4 marks)
See Question 16 solution.
Question 17: Halflife & decay constant
Technetium99m is a commonly used medical radioisotope. It is a gamma emitter and is used for diagnosing a number of bone conditions.
The graph below shows the decay rate for a radioisotope in the blood of a patient after a nuclear medicine procedure.
(a)  What is the halflife of Technetium99m?  1 mark 
(b)  Calculate the decay constant λ for technetium99m.  2 marks 
See Question 17 solution.
Question 18: Hubble’s Law
Hubble provided observation proof that the universe was expanding and supported the prediction of Friedmann of an expanding universe.
Explain how he used cosmic redshift observations and Cepheid variable stars to provide the observational proof. (5 marks)
See Question 18 solution.
Question 19: HertzsprungRussell Diagram
A possible evolutionary path of a star is shown on the HertzsprungRussell (HR) diagram.
(a)  Which of the stars is producing the greatest amount of light? Give a reason for your answer.  2 marks 
(b)  Which star has the lowest surface temperature? Give a reason for your answer.  2 marks 
See Question 19 solution.
Question 20: Evolutionary stages for a star
The evolutionary tracks of two stars, X and Y, are shown in the diagram below.
(a)  Briefly explain the initial stage of formation of a star.  2 marks 
(b)  Which star, X or Y, has the larger mass? Give a reason for your choice.  2 marks 
(c)  Explain why a star ten times more massive than the Sun stays on the main sequence for a much shorter time than a star of 1 solar mass  2 marks 
(d)  The evolution of star Y after it leaves the main sequence can be summarised as follows: Red giant → Planetary nebula → White dwarf Describe the properties of Red giant and White dwarf in terms of  surface temperature relative to the sun
 luminosity relative to the sun
 nuclear reactions relative to the sun
 3 marks 
See Question 20 solution.
Related: Additional Module 8 Practice Questions
Solution
Q  Answer 
1  (a) Analyse the forces acting parallel and perpendicular to acceleration. T\sin\theta = ma \ and \ T\cos\theta =mg \therefore \frac{T\sin\theta}{T\cos\theta} = \frac{ma}{mg} \\ tan\theta = \frac{a}{g} \\ a = \tan\theta (b) Find an expression for ω and then calculate. Step 1: Find the expression for tan θ the string makes with vertical tan\theta = \frac{r}{h}=\frac{3}{4} Step 2: Find an expression for ω a = g\tan\theta \\ r\omega^2 = g\tan\theta \\ \omega =\sqrt{\frac{gtan\theta}{r}} \\ \omega = \sqrt{\frac{9.8 \times \frac{3}{4}}{0.3}} \\ \omega = 5.0 rad/s (c) The centripetal force is given by F_c=mr\omega^2 F_c=0.1 \times 0.3 \times 5.0^2 = 0.75 N 
2  (a) The force diagram is shown below. The components of the normal force are:  Horizontal component: Ncosθ
 Vertical component: Nsinθ.
The horizontal component is in the same direction as the centripetal acceleration: N\sinθ = \frac{mv^2}{r}(b) Analysing the forces horizontally and vertically gives: N\sinθ = \frac{mv^2}{r} \\ N\cosθ = mg \\ \therefore \tan\theta = \frac{v^2}{rg} \\ v= \sqrt{rg\tanθ} v= 12.82 m/s 
3  (a) The speed of the carriages are the same at all positions. (b) a = 0.0016 ms^{2 }towards the centre of rotation. (c) Tension is acting up at point C. T = mg + ma = 3.14 \times 10^5 N. (d) Tension is greater at point C when it is moving compared to when it is stationary. However the difference is small due to low speed and acceleration. 
4  (a) For zero gravity, a = g . Hence r = 3306 m (b) No. The force of gravity or gravitational force is not zero. However, the passenger’s apparent weight is zero since he is free falling at the same rate as the airplane. This gives the passenger a sensation of being weightless. 
5  (a) At point B. Total energy is constant in orbit. At largest radius, U is greatest so K must be smallest. (b) Kepler’s second law states that a line between the Sun and the comet sweeps an equal area in equal time, therefore its orbit travels a greater distance when it is closer to the Sun. As seen in the diagram, if A1 and A2 are equal areas, when the comet is closer to the Sun it needs to travel a greater distance in its orbit compared to when it’s further away to sweep the same area in the same time. 
6  (a) The resultant magnetic field patten is shown below. (b) B = 7.5 x 10^{5}T 
7  (a) End A is negative and End B is positive. (b) Bar is moving across a uniform magnetic field. Due to its relative motion, charges in the bar are moving perpendicular to the uniform magnetic field. Therefore, charges experience magnetic force resulting in electrons being separated from the positive charges. Hence a potential difference is setup known as emf – electromotive force. (c) 
8  (a) To determine the change in magnetic flux, we must first calculate the change in magnetic field strength from the graph. Step 1: Calculate the change in magnetic field strength over the 1.0 s period. \Delta B= 0.8(0.5) = 1.3 T Step 2: Calculate the change in magnetic flux \Delta \Phi = \Delta B_\perp A=1.3 \times \pi (0.02)^2 =0.00163 \ Wb (b) Calculate the induced emf using the Faraday’s law of induction. \varepsilon = N \dfrac{\Delta \Phi}{\Delta t}= 100\dfrac{0.00163}{1.0} =  0.163 \ V 
9  d\sinθ = mλ \\ d \frac{\Delta x}{L} = m \lambda \\ \Delta x = \frac{m \lambda L}{d}  Decreasing the slit separation (d) will increase Δx.
 Increasing the distance between the double slits and the screen (L) will increase Δx.

10  I_{C }: I_{A }= 1 : 4 
11  The flowchart below outlines the process undertaken by Fizeau for determining the speed of light. 
12  Spectrum A: Incandescent globe is considered a blackbody and produces a blackbody spectrum. Spectrum B: Mercury vapour lamp produces discrete, specific wavelengths of light. It does not produce a continuous spectrum 
13  (a) Star A has narrow absorption lines similar to the discharge tube and shows no signs of Doppler broadening, hence it is not rotating significantly (low or zero rotational velocity).Star B has wide absorption lines arising from Doppler broadening, hence must be rotating at higher speed. (b) Light from the star will be shifted as a result of the Doppler effect and its motion relative to Earth. A blueshift indicates the star moves towards Earth and a redshift indicates the star moves away from Earth. The amount of shift indicates the speed. 
14  (a) The times on each clock were different as each clock experienced a different amount of time dilation. The eastwards moving clock recorded a shorter time than the ground clock. The westwards moving clock recorded a longer time than the ground clock. (b) The clocks travel at different speeds relative to the Earth’s axis and experience different amounts of time dilation. Hence they will be showing a different time for the duration of the experiment. The experimental results were consistent with the predictions of relativity. 
15  (a) Use the flowchart below to describe the method. (b) Charge of a particle is quantised. 
16  The de BroglieBohr model of the atom had electrons orbiting as one dimensional standing waves in circular orbits. Schrodinger’s wave equation extended de Broglie’s proposal that particles have a wavelength and nature to fully characterise the waveform of particles in three dimensional space. When solved for electrons around a nucleus, Schrodinger’s equation shows that electron waveforms are 3D standing waves of different shapes and energies. The resulting quantum model of the atom is thus 3D, and describes the structure, energies, transitions, and interactions electrons can have, properly accounting for element structure, line spectral details, and chemical reactions. 
17  (a) 6 hours (b) λ = 0.116 hour^{1} 
18  Cepheid variable stars were seen to pulsate in brightness with consistent period. By using parallax to measure the distance to nearby Cepheids, their luminosity could be calculated. It was found that there was a clear relationship between the luminosity of a Cepheid and its period of pulsation. This information was used when very distant Cepheids were observed. Their observed period of pulsation was used to determine their luminosity by the relationship, and with luminosity then known their brightness was observed to then determine their distance. Meanwhile Hubble had observations of the spectrum of light from the same distant galaxies in which the Cepheids were observed. The spectrum shown known atomic lines but redshifted, indicating a recessional speed. Hubble thus knew the distance from which these redshift and recessional velocities were. Hubble plotted the speed from the redshift against the distance. He found a linear relationship. This was a very strong trend and independent of direction (isotropic). This is what would be observed in an expanding universe, and would be very unlikely to be observed in a universe that wasn’t expanding. It was thus very strong observational proof that the universe is expanding. 
19  (a) Star C: It has the largest luminosity and hence produces the greatest amount of light. (b)Star C: It has the highest colour index, so the reddest colour and lowest surface temperature. Star A is a protostar. 
20  (a) Gravitational force compresses and heats a cloud of gas until temperature and pressure are high enough to start hydrogen core fusion. (b) Star X. A higher mass main sequence star is more luminous and hotter than a lower mass main sequence star. (c) Higher pressure and temperature mean much higher fusion rate. The star uses its larger amount of fuel much quicker. (d) Red giant:  Lower surface temperature
 higher luminosity
 Fusion of helium to produce carbon
White dwarf:  Higher surface temperature
 lower luminosity
 No nuclear fusion

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Written by DJ Kim
DJ is the founder of Learnable and has a passionate interest in education and technology. He is also the author of Physics resources on Learnable.
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