I didn't realise this thread was here and posted my post-exam writeup in the new spec thread. I'll put it here anyway.
1:
What is an isotope (2) variant of a molecule with same no. protons different no. neutrons
Find the number of electrons (2) should be 3, as the new charge was +4.8e
Fill in the blanks for uranium decaying into neptunium (3) +1 onto proton no., keep mass no. the same, should be a beta-minus with 0 mass no., and -1 proton no., and an anti-electron neutrino. (Mass number is the number which is lower down, and proton number the one higher up).
Fairly simple
2.
What is the process of an electron-positron pair being formed (1) pair production
Which quark structure shows a positive kaon (1) should be up, antistrange
Show that lepton number is conserved (2) it's zero before, the muon+ is an antilepton and neutrino is a lepton so 0 after too
What isn't conserved in the above interaction (K+ -> muon+ + neutrino) (1) strangeness
Fill in the table for a Positive Kaon, Positive Muon and a Neutrino, under the headings of Hadron, Meson, Charged, Baryon, Lepton (3)
A positive kaon can also decay into a positive pion and mystery particle X, identify X (3) I think it had to be a non-lepton, non-baryon, uncharged particle so must be a meson, I think I put neutral kaon or maybe a neutral pion
3.
How does excitation occur (3) collision of electrons accelerated by p.d. within tube collides with orbital electrons of the mercury move up a discrete energy level and some other stuff i don't fully recall
How does excitation cause photoelectric emission in the UV spectrum or something like that(2)
How is visible light formed (2) powder or paint coating on inner walls of tube has different energy levels for it's electrons who are excited by the other photoelectrons which have the exact energy required to excite them to a specific energy level and leads to different photoelectrons emitted or whatever
Find the characteristic frequency and state a unit for photons with energy of 1MeV, got something x10^20 but this is easily checkable (2)
Maybe another part after this, I don't remember
4. What was this?
5.
Draw a labelled circuit that would allow the student to do the test with the diode (3) I did a cell with a variable resistor as a potential divider in series with a voltmeter/fwd-bias diode (which are in parallel), and an ammeter in series
6 marker, how to do the test between OA (from I/V graph in stem of question, which was from 0.6v up assuming that's the correct point) Things it said to do were why a datalogger would be advantageous, safety precautions for the experiment, how many results and the interval, as well as how the data would be gathered
6. over question
Find either the peak-peak voltage or peak voltage for a 230V 12W power supply (my friends differ on this) (2?) It was either 230sqrt2 to get 325v or 650v to get the peak to peak
Find the heating effect (3) Did P = I x I x R, for R = 18 Ohms, P / V = I = 115/6, then multiply the current by either the peak voltage or rms voltage, to get 6200W or 4400W
Wires have resistance of 0.0150 Ohms every metre, 2 wires each of length 3.15m, why will the oven not reach the desired voltage of 230V (2)
Find the voltage reached by the heating element due to the wires (3) I think it was 228V
Something else about heating effect due to resistance of wires, (1-2?) Got 34W
6. AC
What electrical element is shown by the the jump from P -> R (1) electromotive force I put
Find the value of this electrical element (1) They snuck in the scale of 2v/division so it should've been 6v if I remember correctly
Why does the line fall to PQ when the second switch is closed (2) There was the 18 Ohm resistor so it receives a portion of the p.d. or whatever
What is the current in the circuit when both switches are closed (2) I think it was 0.272727... = 0.27A = 5/18
Find the internal resistance of the battery (2 or 3) I got 21.6Ohms ON SECOND THOUGHTS maybe I put 21/6 to get around 3.5Ohms or something
7. Memory is faded
updating as I remember more