WJEC AS Physics PH2 June 4th 2015

I also thought the very last question was a strong interaction? There wasn't any gamma ray involvement and u and d numbers were individually conserved?

And I always thought that weak took much longer than strong/E-M, therefore lower energies (and it mentioned high speed in the question).

And for the second part of question 1 where it asked why the student's answer didn't make any sense, what did people put? I left that one until the end and put because in progressive waves amplitude is always constant? I asked people in school about it and they put other things, so I'm not sure now.

I put the amplitude of a progressive wave is constant (since the student implied that it wasn't, as they said it was the distance between 2 points with the same amplitude, if you know what I mean )

I got all the same, wasn't sure about the crests so I'm glad someone else did them 1/3 along too

Really annoyed with myself as I put a strong interaction for the particle question because I saw the small time period, and was completely oblivious to the neutrino that's the price you pay for rushing lol

Messed up the frequency and the star temperature, pretty sure I got everything else right though

Star temp ~4140 (for both values).
Fundamental (first harmonic) frequency 16.7 Hz.
Did you get either of those (assuming that's the frequency you were talking about)?

My star temp was ~13450 which I obviously realised was wrong after and couldn't get the answer to be around 4000 so I just left it at that lol. And I couldn't work out the v for the frequency so just made up a value and my frequency was 20Hz lol

Star temp ~4140 (for both values).
Fundamental (first harmonic) frequency 16.7 Hz.
Did you get either of those (assuming that's the frequency you were talking about)?

v was 80 and wavelength was double the distance between the walls i.e. 4.8. So v/(lambda) = 16.7 Hz. It was only 2 marks though, since one mark was for the sketch of the string.

Damn I should have clocked that, ah well, pretty sure I got everything else right anyway

It's a shame that wjec isn't more common there's only a few of us posting 😂

I also thought the very last question was a strong interaction? There wasn't any gamma ray involvement and u and d numbers were individually conserved?

And I always thought that weak took much longer than strong/E-M, therefore lower energies (and it mentioned high speed in the question).

And for the second part of question 1 where it asked why the student's answer didn't make any sense, what did people put? I left that one until the end and put because in progressive waves amplitude is always constant? I asked people in school about it and they put other things, so I'm not sure now.

It took me about 20 minutes of thought to get...