AQA Physics Unit 1 PHYA1 20th May 2013

Both hadrons and leptons decay using the weak interaction. All leptons (aside from neutrinos) eventually decay into an electron, just as Hadrons decay to the proton, as it is the most stable lepton. Both types also experience electrostatic and gravitational forces, though the latter is almost completely negligible at those masses. The main difference was that Hadrons experience the strong force, while leptons do not.

Electron capture is a decay.

Proton is not a lepton, it is a baryon. But you are correct with the rest.

From my very bad memory I seem to remember getting 4.01x10^6 for specific charge, is this what people got?

I did not say a proton was a lepton. I said that, in a similar way as all hadrons decay to the proton, all leptons decay to the electron.

From my very bad memory I seem to remember getting 4.01x10^6 for specific charge, is this what people got?

I think that's what I got..

1) 20 p, 28 n, 18 e
2) + 3.2 x 10 ^-19 J
3) 3.99 x 10 ^ 6 C/kg
4) feynman stuff ( d quark, W+ Boson, positron, electron neutrino)
5) weak interaction
6) B
7) mass/charge/range etc
8) I did baryon number and electron lepton number conservation but there are mpre
9) big 6 marker, pretty easy
10) particle/ antiparticle: i did electron and positron and said charge was opposite

11) max and range of KE: photons energy dependant upon freq. as E= hf. Ekmax = hf - phi thereofore max KE exists. Range of ke's because more energy needed to remove deeper electrons etc.
12) prove 1.8eV (pretty easy)
13) what is threshold freq. : i got like 4.4 x 10 ^14 Hz
14)increasing frequency increases max KE of emitted electrons as by equation or by photon energy route, your choice
15) Double intensity doubles number of photons per second which doubles number of emitted electrons per second

16) peak to peak = 128V
17) peak = 64V
18) Vrms = 45 V
19) freq. = 100 Hz
20) horizontal line at 45V
21) time base: 2ms/div y sensitivity: 16V/div dunno about 3rd mark

22) 4.2 x 2.5 = 6.3V
23) 12- 6.3 = 5.7V
24) 5.7 / 2 = 2.85A
25) 4.2 - 2.85 = 1.35 A
26) R = 5.7 / 1.35 = 4.2
27) I said total R is 1.4 but if it incuded internal resistance then it was 2.9 ohms
28)think something after but forgot sorry

29) current = 6/ (50 + 35 + 5 ) x 1000 = 6.7 x 10 ^-5 A
30) V = 0.33V
31) increas intensity decreases toatl resistance which increases total current thereofre voltemeter value is greater (alternatives possible)
32) 30000 ohms

Yes, but I did it to two significant figures. They'll probably still give you the mark though.

this is a start, add to it plz