PHYA5 ~ 20th June 2013 ~ A2 Physics

Does anyone know if there is a separate formula sheet for the optional topics or not?

Hey everyone! Could someone help me to please clarify this? I thought that the answer may be beta. My logic was based on the idea that it couldn't be alpha, given that alpha particles have the same initial kinetic energy (due to the conservation of momentum). And so I thought that it could not explain for why the paths shown in the cloud chamber were of different lengths. I then thought it may be beta (given that beta particles can have different kinetic energies). But then yet again it made me consider that beta particles have a curved track in a cloud chamber.

The answer is alpha. Could someone please help me to clarify this? Thanks!

Erm I'm not too sure about your explanation of kinetic energies as I thought alpha was emitted with random energies of up to 10eV.

I think they just want you to realize the short range and conclude that alpha particle is being emitted. It's only part a) & one mark, so keep it simples!

And yh I think beta particles also would have had a more curved track

Hey everyone! Could someone help me to please clarify this? I thought that the answer may be beta. My logic was based on the idea that it couldn't be alpha, given that alpha particles have the same initial kinetic energy (due to the conservation of momentum). And so I thought that it could not explain for why the paths shown in the cloud chamber were of different lengths. I then thought it may be beta (given that beta particles can have different kinetic energies). But then yet again it made me consider that beta particles have a curved track in a cloud chamber.

The answer is alpha. Could someone please help me to clarify this? Thanks!

Just wondered if anyone knew of more exam packs for this Unit 5 topic? Since there are only 3 past papers on the AQA website and I cant seem to find any decent websites with questions that will actually help!

The optional module we're doing is applied physics, so if anyone knows any good websites for that and the main part everyone does I would really appreciate it!!

http://www.freeexampapers.com/index.php/?location=A+Level%2FPhysics%2FAQA%2FPhysics+A

This site has all the past papers from previous specification. But you'll have to pick out questions that are relevant.

Thanks! When I click to open them it says it may harm my computer though

Hmm that doesn't come up on my computer.
Try this site instead

Oh thanks that one works I'll go on the other one and print them all off when I'm at school, I mean who cares about their computers right!

Haha

I'm a bit worried that there aren't many past papers for the new specification... I need to do a lot of practice under timed conditions as I keep running out of time!

Can someone explain why discrete photons are given off when a beta particle is produced?

Are they ?

Or do you mean it passes through a cathode ray tube full of inert gas, or when it hits a fluorescent screen ?

Can someone explain why discrete photons are given off when a beta particle is produced?

Can someone explain why discrete photons are given off when a beta particle is produced?

No, that has nothing to do with nuclear Physics?

This is a june 08 question : Explain why sources of beta radiation often also produce gamma rays of discrete energies. You may be awarded for communication etc.