1, i put 11 microfarad for first part i clearly put gradient = q/v and triangle will i pick up marks 2, the question after will there be ecf for it 3, time constant i used ln0.8 how many marks lost 4, could i talk about the mass in beta minus p question and link to kinetic equation
thanks
1. Probably. 2. Probably, but only if you used the right method in the first part (which it sounds like you did). 3. No one knows. 4. No one knows.
For the last question on section B, I thought that no current is induced in the wheel because it's not connected to a circuit? So there's a magnetic force on the wheel which causes it to slow down but no current. Does anyone know if i'm going to lose marks if I didn't talk about electromagnetic induction in that part?
exactly what i did. we're right that there is no current , but the is emf induced and i didn't mention that
Damn, how many marks was it out of? I am pretty sure I got the formula right so I got 202s I think.
I dont remember how many marks it was out of. But I also accidentally used 0.8 instead of 0.2 and I got the same answer as you (202s). We wont lose that many marks for it though, since the method is correct and then there "might" be ECF for the next part.
Anyone know what was the answer to Q20 multiple choice? The one about capacitors that we had to select which option had the correct graphs for Voltage and for Current i think...
I put that N only including the mass of the nucleons of the atom, and did not take into account the mass of the electrons. So, as a beta particle primarily involves an electron, m and N would be the same mass.
Does that look like an acceptable answer?
Hmm, doesn't sound quite right. Why would m and N be the same mass? m is the mass of an electron (in the latter case) and N the mass of the nuclei.
I think what they are really looking for is the fact that the velocity of the electron varies; the kinetic energy of the alpha particle is, conversely, constant due to the nature of the decay.
The momentum of the electron varies since some of the momentum is shared between the electron and some by the antineutrino. The proportion that goes to each varies from decay to decay.