PHYA1 - Physics Unit 1 Exam - 24th May 2011

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i dont think we have mentioned the one in the first question yet about whether particle X was a lepton baryony or meson
i put baryon but i wouldnt count on any of my answers

It was a baryon

A proton was formed, which is a baryon
To conserve baryon number, X had to be a baryon

Reply 341

Aish93

what did you put for the difference between the special particles?

Reply 342

LewisS911

Am i the only one that got 3.3A for the 2nd to last one? I did 10/3. I used 10v because over a parallel combo, the voltage on each side is equal to the max voltage; and on that specific side there was only one component so all of the voltage was passing through it. no? :confused:

Also i got 5v for the last one because if the resistance in the two resistors is the same - THe current will also be the same. And as there are two components, the total Voltage through one resistor is the max V/2. (10/2 = 5)

Reply 343

Spas_13

Original post by Dizzy in my Head

What do you mean wrong, they got that right!

It asked for two baryons, one of which is a neutron (though you needed to state two - but you still got one mark if you didn't).

They won't get the mark for that. It wasn't specific to the question. You had to mention both bayrons in context, just checked with my Physics teacher.

Reply 344

Dizzy in my Head

Original post by Lucy149

i dont think we have mentioned the one in the first question yet about whether particle X was a lepton baryony or meson
i put baryon but i wouldnt count on any of my answers

I got baryon, too, as the baryon number would not be conserved if it wasn't. :smile:

Reply 345

jackegan93

What was the argon question? Was the proton number +1 more and the nucleon number the same?

Reply 346

Dizzy in my Head

Original post by Spas_13

They won't get the mark for that. It wasn't specific to the question. You had to mention both bayrons in context, just checked with my Physics teacher.

Yeah, I'm sorry - I was skim reading and thought they had put neutron. But you can't dent the confidence of people in telling them they'll have to re-sit, it's bad enough finding the question they thought was right is wrong!

Reply 347

Dizzy in my Head

Original post by jackegan93

What was the argon question? Was the proton number +1 more and the nucleon number the same?

No, it was +1 for the proton number, and the same for nucleon number - as it wasn't beta minus decay, it was beta plus decay...

Reply 348

jackegan93

Bro you just said what I said.. and Ok fair enough can't remember the question

Reply 349

LewisS911

Can somebody answer my question please? :smile:

It's up this page about the last two question.

Reply 350

jackegan93

Original post by LewisS911

That parallel combo was only exposed to a voltage of 4v, as it was in series with the other resistor Z

Reply 351

chemkid

Can someone answer my question as well please - it's on the previous page. Thanks :smile:

Reply 352

Keiran:.

Original post by LewisS911

Can somebody answer my question please? :smile:

It's up this page about the last two question.

yeahh i think your right i did get the answer but for some reason i divided the 3.3A by the root 2? dont know why

imk just really confused right now the paper was horendous!

Reply 353

Spas_13

Original post by Dizzy in my Head

Yo mate, just found out that you were correct, I was wrong. It turns out both answers are valid.

Reply 354

jackegan93

Can anyone remember the question about the Argon atom, like what it actually said?

Reply 355

TooEasy123

Original post by TooEasy123

Well anyway the top equation didn't conserve strangeness. And strangeness is conserved in strong interactions. So the top one can't work.

Reply 356

jackegan93

Original post by TooEasy123

Well anyway the top equation didn't conserve strangeness. And strangeness is conserved in strong interactions. So the top one can't work.

That's actually what I said.. will I still get marks?

Reply 357

maths134

Original post by jackegan93

That's actually what I said.. will I still get marks?

TBH i doubt it and I gave this as an answer. Its only 2 marks tbh, u can drop like 7 and get 100% =D

Reply 358

Naum

Original post by TooEasy123

Well anyway the top equation didn't conserve strangeness. And strangeness is conserved in strong interactions. So the top one can't work.

The top equation underwent Weak Force interaction, AFAIK. The quark flavour changes, so the top one looked valid. The second one had unbalanced lepton numbers.