VCE Physics Question Thread!

[skobaby]

Hey Physics: my teacher has kindly done worked solutions videos for the VCAA 2015 paper.  If anyone has any troubles with the paper, definitely check him out!  It helped me!

LINK: https://www.youtube.com/playlist?list=PLs46E_EDggXrJFhmwe_fMDXgCu_bY99kd

[HopefulLawStudent]

Can someone confirm whether this is within the scope of the SD?

But basically intensity = power/ area, both waves are travelling a greater distance so their intensity decreases

I'd say that it is; largely cos I think there was a VCAA exam that went into why the central band had the largest intensity (and that isn't a big jump from what ^ was asking...) Well... I think it was VCAA??

[Swagadaktal]

I'd say that it is; largely cos I think there was a VCAA exam that went into why the central band had the largest intensity (and that isn't a big jump from what ^ was asking...) Well... I think it was VCAA??

Yeah I think I know which q you were talking about but that was pre 2013 SD - I don't think they can ask about that in the new SD?
And any questions about intensity post 2013 simply states "bright band" or "dark band" and nothing more...

Nothing about that in SD soo

[trystan.paderno]

how many decimal places should i correct to on the physics exam? they dont specify
also how do i know if my calculator is truncating answers and will this cause problems in the exam if it is? and how do i fix it if so? im using the casio fx-82AU plus

anyone ? just need to put my mind at ease, for example i get a radius or 109325730.6 and the vcaa report says 1.1x10^8 whitch i understand is to 2 significant figures but would i be penalised for my answer? and do i need to correct to the 2 sig figs

[HopefulLawStudent]

anyone ? just need to put my mind at ease, for example i get a radius or 109325730.6 and the vcaa report says 1.1x10^8 whitch i understand is to 2 significant figures but would i be penalised for my answer? and do i need to correct to the 2 sig figs

Significant figures doesn't tend to be that big of a deal in Physics... unlike chem where sig figs is life. Maybe don't write "109325730.6" as an answer, purely because it's a waste of time; generally speaking 2-3 should be fine imo. But don't stress too much about it.

[trystan.paderno]

Significant figures doesn't tend to be that big of a deal in Physics... unlike chem where sig figs is life. Maybe don't write "109325730.6" as an answer, purely because it's a waste of time; generally speaking 2-3 should be fine imo. But don't stress too much about it.

so 1.09x10^8 would be fine
thanks for the reply

[HopefulLawStudent]

Quick Q:

Compare the types of energy transfers occurring in the LED with the energy transfers in the resistor in this circuit. - 2013, VCAA

Am I allowed to say that in the LED, electrical energy was converted to light energy and heat energy. Or is that not true??

[Calebark]

Quick Q:

Am I allowed to say that in the LED, electrical energy was converted to light energy and heat energy. Or is that not true??

This is true. I think you could get away with that. Alternatively, you could call it an ideal LED, and say it converts to light energy.

[kateedelaney]

CAN SOMEONE PLEASE HELP ME IN DESCRIBING THESE DOTPOINTS 

– qualitative effect of wavelength, distance of screen and slit separation on interference patterns
• Interpret electron diffraction patterns as evidence for the wave-like nature of matter
• explain the production of atomic absorption and emission spectra, including those from metal vapour lamps
• analyse the absorption of photons by atoms, not including their bombardment by electrons, in terms of:
– the change in energy levels of the atom due to electrons changing state
– the frequency and wavelength of emitted photons, E = hf = hc/λ
•  describe the quantised states of the atom in terms of electrons forming standing waves, recognising this as evidence of the dual nature of matter

[plants]

Hey dudes!! In the 2015 exam, question 13, it asks you to identify the direction of current as the loop enters the magnetic field. I'm getting Y to X, but their answers say X to Y. I don't understand why - even with their explanation in the assessment report.

[FallingStar]

qualitative effect of wavelength, distance of screen and slit separation on interference patterns
Equation:

- Increasing the wavelength increases fringe spacing.
- Decreasing the separation between the two slits increases fringe spacing.
- Increasing the distance to the screen from the source increases fringe spacing.

Interpret electron diffraction patterns as evidence for the wave-like nature of matter
If electrons were a particle, we would expect the pattern to look like this, if they are passed through a double slit:


But instead, we get this:


Isn't that similar to what happened in Young's double slit experiment? Well, waves causes interference patterns, which explains the multiple light and dark screens of electrons.

Although I don't have any good ways to explain the latter of your question (can someone else please explain).

[HiggsBShouldB140GeV]

Hey dudes!! In the 2015 exam, question 13, it asks you to identify the direction of current as the loop enters the magnetic field. I'm getting Y to X, but their answers say X to Y. I don't understand why - even with their explanation in the assessment report.

Hey dude! I'm not sure if you've picked up on it yet, but the question states for the direction of the current THROUGH the voltmeter. So we from the perspective of the current flowing through the voltmeter first we can see that it flows from X to Y.

Soz if its already solved prior to this response. 

[plants]

Hey dude! I'm not sure if you've picked up on it yet, but the question states for the direction of the current THROUGH the voltmeter. So we from the perspective of the current flowing through the voltmeter first we can see that it flows from X to Y.

Soz if its already solved prior to this response. 

Ohh lol. Thanks my man. What a cheeky bastard VCAA is

[Willba99]

Hey, so i recently did the sample exam at http://www.vcaa.vic.edu.au/Documents/exams/physics/physics-specs-samp-w.pdf which is vcaa's sample exam for this study design. Problem is, i can't find the solutions for them. Does anyone know where to find them? The link to the exam is on the vcaa site at http://www.vcaa.vic.edu.au/Pages/vce/studies/physics/physicsindex.aspx
Thanks

[plants]

Hey, so i recently did the sample exam at http://www.vcaa.vic.edu.au/Documents/exams/physics/physics-specs-samp-w.pdf which is vcaa's sample exam for this study design. Problem is, i can't find the solutions for them. Does anyone know where to find them? The link to the exam is on the vcaa site at http://www.vcaa.vic.edu.au/Pages/vce/studies/physics/physicsindex.aspx
Thanks

Solutions can be found on itute :^):
http://www.itute.com/2010/10/11/free-download-2013-2016-sample-physics-examination-solutions/