AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread]

link

link

Can someone help me with special relativity.

I always thought that t0 was the time recorded by someone observing an event and t for someone travelling with the event.

I get some questions right and then some wrong. It's so depressing


Posted from TSR Mobile

That's true, what's wrong with that?


Posted from TSR Mobile

I think you're mistaken

did you mean mass defect?

I know an A* Is roughly about 52 out of 75, but what is 120(full) UMS? I did really well in PHYA4, so I want to do as best as possible to achieve an A*

Posted from TSR Mobile

Theoretically yes but once a nuclide is fissioned then the nuclides formed require a huge amount of energy to be fused together as the electrostatic repulsion between the protons of each nuclide doesn't allow the nuclides fuse as the nuclides would have to be so close together for the strong nuclear force to "grab" them together


Posted from TSR Mobile

Is it the same for l0 and l as well as m0 and m?




Posted from TSR Mobile

I know an A* Is roughly about 52 out of 75, but what is 120(full) UMS? I did really well in PHYA4, so I want to do as best as possible to achieve an A*

Posted from TSR Mobile

And that's why they fissioned in the first place?

Yes

Quite so but not necessarily. Because, for example, two hydrogen atoms joined together are so stable that they wouldn't decay. But if you separated them then joining them would be something of a challenge


Posted from TSR Mobile

Do you think if I learn everything in the cgp book on fusion, fission and binding energy that would be enough or do you really need to understand it in depth... Are we likely to get a 6 mark question on it?

That's 58 out of 75 for full UMS

Predictions for 6 marker on Astro?

I have to get 112 ucas points for a B THATS GOING TO BE NEXT to impossible for me!!

Surely A* is not 52/75... Do you mean A?