PHYA5 ~ 20th June 2013 ~ A2 Physics

What do we think about potential 6 markers for turning points?
I'd say maybe something to do with special relativity or discovery of the electron

Electron microscope


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Transmission maybe? Because I think there has already been a scanning tunnelling?
Or it could be both I suppose

I see what you mean here... logically in that respect the other person would be travelling 1.2c relative to you.

What would we then do to find the time relative to the "other person" (to go from A to B)... you could have the time you saw them go from A to B... but if you use 1.2c in the Lorentz factor... you can't square root that?

So they couldn't possibly ask us to do a calculation in situations such as this one?

Maybe they could ask it as a written question instead... where we'd have to quote E=mc^2 & that KE is converted into mass, therefore in reality it would never actually reach that speed?

Yeah respective to you someone's travelling at 1.2c however this is impossible as nothing can travel faster than the speed of light , c.

So for all of this to work, you have to change other factors like time and length.


I wasn't saying that they'd ever ask anything about it, but I never really understood the point of special relativity until someone explained it to me like that, that was all sorry if I've confused you aha


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aha no it's okay... I'd actually never thought of it from the perspective... "head on" hehe

Also I am confused because even a person would not be able to observe something with their eyes... something going faster than the speed of light, it is quite confusing, but pretty cool

I think it would be a good question, as a written question

Guys how many significant figures should we generally use?

Sorry if this has been asked/discussed before but I'm late ITT.

Possible 6 markers for nuclear and astro?

The nuclear paper has had two nuclear based long-answer Qs, and 1 thermal. So I'm thinking maybe thermal will come up, the derivation of pV = 1/3 NM(crms)^2 perhaps?

No idea about astro though tbh

Sorry if this has been asked/discussed before but I'm late ITT.

Possible 6 markers for nuclear and astro?

The nuclear paper has had two nuclear based long-answer Qs, and 1 thermal. So I'm thinking maybe thermal will come up, the derivation of pV = 1/3 NM(crms)^2 perhaps?

No idea about astro though tbh

Derivation of pV=blah blah.. I'm hopin that comes up because I won't attempt the 6 marker anyway and that one most people will get 0/6 because it's really hard, so lower grade boundaries overall (not to sound harsh or anything). Other than that radioactive waste, something to do with specific heat/latent heat.

Astro could be evidence for big bang theory, how reflecting telescopes work and advantage over refracting, life cycle of stars (giants and main sequence), something annoying on spectra and spectral classes.

If I'm not mistaken, I thought the derivation of the kinetic theory equation wasn't required for this spec? :s.

Can someone explain the electron diffraction experiment to me? I found it in one of the papers but none of my books :/

Sorry if this has been asked/discussed before but I'm late ITT.

Possible 6 markers for nuclear and astro?

The nuclear paper has had two nuclear based long-answer Qs, and 1 thermal. So I'm thinking maybe thermal will come up, the derivation of pV = 1/3 NM(crms)^2 perhaps?

No idea about astro though tbh

No worries, sorted.

On the topic of this exam, we're doing turning points and the paper they give on it is ridiculously hard, anyone else doing turning points?