Post by: superflya on February 11, 2010, 08:36:31 pm
and btw physics board was kinda dead, not cool ;)
Post by: TrueTears on February 11, 2010, 08:38:57 pm
it has no mass tho, so don't ask me why it still has momentum, all i know is that it just does from my VCE physics knowledge.
Post by: superflya on February 11, 2010, 08:41:57 pm
wtf theres no mass, kg? ahah this is bull
Post by: Edmund on February 11, 2010, 09:33:59 pm
where the units for Plank's constant is J.s, wavelength is m, Joules is equivalent to N.m, Newtons is equivalent to kgms-2
Post by: QuantumJG on February 11, 2010, 09:35:08 pm
just a random question i came across, had me puzzled :P
and btw physics board was kinda dead, not cool ;)
Yes photons do have momentum. This momentum is given by;
A photon can act like a particle and it can also actually change the motion of something (I.e. Photons can collide with objects and change their velocity). The thing with quantum mechanics is that you can't apply classical mechanics to these situations.
There is also the Heisenberg uncertainty priciple which states:
Which says the uncertainty in momentum multiplied by the uncertainty in position must be greater than or equal to h divided by four pi (aka h-bar on 2).
You will learn about the photon in unit 4 physics and it's really fun.
As for physics posts you probably won't see many for there is only 4 people I know on VN who are majoring in physics in uni. At UoM there is really only 30 students who will do a master of science in physics.
Post by: moekamo on February 11, 2010, 09:35:40 pm
Post by: superflya on February 11, 2010, 09:39:40 pm
Post by: /0 on February 11, 2010, 10:13:46 pm
That's what's so awesome about advanced physics... everything just comes together so beautifully
Post by: appianway on February 11, 2010, 10:16:26 pm
Edit: I love the energy/mass thing. I love relativistic collisions and the changes in mass that often occur. :)
Post by: /0 on February 11, 2010, 10:24:40 pm
I don't think it's E=mc^2 exactly, but I think it's to do with the relationship between energy and 4-momentum. The energy of a photon can be given by E= hf = hc/lamnda, and p=E/c.
Edit: I love the energy/mass thing. I love relativistic collisions and the changes in mass that often occur. :)
Yeah I think the full form of
Which reduces to
Post by: Edmund on February 11, 2010, 10:26:05 pm
So I could say m=0
And the energy of a photon is
EDIT: /0 beat me :(
Post by: appianway on February 11, 2010, 10:29:58 pm
Post by: QuantumJG on February 11, 2010, 10:47:53 pm
I don't think it's E=mc^2 exactly, but I think it's to do with the relationship between energy and 4-momentum. The energy of a photon can be given by E= hf = hc/lamnda, and p=E/c.
Edit: I love the energy/mass thing. I love relativistic collisions and the changes in mass that often occur. :)
Yeah I think the full form ofis something like
Which reduces tofor a massless particle and
That formula rings bells for me.
Post by: Edmund on February 11, 2010, 11:15:08 pm
Physics 1 =/I don't think it's E=mc^2 exactly, but I think it's to do with the relationship between energy and 4-momentum. The energy of a photon can be given by E= hf = hc/lamnda, and p=E/c.
Edit: I love the energy/mass thing. I love relativistic collisions and the changes in mass that often occur. :)
Yeah I think the full form of
Which reduces to
That formula rings bells for me.
Lots of bad memories :(
Post by: /0 on February 12, 2010, 03:49:43 am
stupid vce... if only I didn't have to do it at the same time
Post by: QuantumJG on February 12, 2010, 11:31:53 am
I wish I studied harder for physics 1 & 2... I definitely don't think I got the most out of the course
stupid vce... if only I didn't have to do it at the same time
Oh well atleast you beat me in uni physics AND vce physics.
At ANU you will probably have a ball with physics. I can't wait to start uni because with physics we have single subjects covering EVERYTHING (apart from the hard core general relativity and more complicated quantum mechanics). First year physics is to try and expose you to a lot of stuff.
Post by: /0 on February 12, 2010, 01:40:57 pm
Post by: QuantumJG on February 12, 2010, 02:51:54 pm
I meant I had a mostly 'problem-solving' type approach to umep instead of trying to understand why things worked... but yeah I hope uni will be a lot of fun
Yeah I understand what you mean by that. But this year I have 7 weeks on classical physics (your mechanics stuff), 7 weeks on thermal physics, 7 weeks on quantum physics, 7 weeks on special relativity, 7 weeks on optics and 7 weeks on electromagnetism and I also have to do an assignment on each area. So physics will become more specialized this year.
Post by: mark_alec on February 12, 2010, 03:47:19 pm
Yeah I understand what you mean by that. But this year I have 7 weeks on classical physics (your mechanics stuff), 7 weeks on thermal physics, 7 weeks on quantum physics, 7 weeks on special relativity, 7 weeks on optics and 7 weeks on electromagnetism and I also have to do an assignment on each area. So physics will become more specialized this year.You will find that the split is 8 weeks/4 weeks, with the majority of time being spent on quantum, thermal and electromagnetism.
A photon has a mass, but only a relativistic mass, its *rest* mass is zero.
Post by: QuantumJG on February 12, 2010, 04:25:45 pm
Yeah I understand what you mean by that. But this year I have 7 weeks on classical physics (your mechanics stuff), 7 weeks on thermal physics, 7 weeks on quantum physics, 7 weeks on special relativity, 7 weeks on optics and 7 weeks on electromagnetism and I also have to do an assignment on each area. So physics will become more specialized this year.You will find that the split is 8 weeks/4 weeks, with the majority of time being spent on quantum, thermal and electromagnetism.
A photon has a mass, but only a relativistic mass, its *rest* mass is zero.
So you are doing physics at UoM? If so do you still have your textbooks (I would like to buy them second hand)? Do I need them or do the lecture notes suffice?
Post by: mark_alec on February 12, 2010, 04:48:16 pm
So you are doing physics at UoM? If so do you still have your textbooks (I would like to buy them second hand)? Do I need them or do the lecture notes suffice?Yes, I am majoring in Mathematical Physics this year.
I have the textbook for thermal physics which is good. Very easy to understand and lots of questions to supplement the theory. For classical physics, never got the textbook, just used the lecture notes provided which provided all that's needed.
Don't bother with a separate textbook for relativity, the quantum book covers what you'd need - that book is a good one for the quantum stuff as the set questions come from there.
Post by: QuantumJG on February 12, 2010, 05:16:28 pm
So you are doing physics at UoM? If so do you still have your textbooks (I would like to buy them second hand)? Do I need them or do the lecture notes suffice?Yes, I am majoring in Mathematical Physics this year.
I have the textbook for thermal physics which is good. Very easy to understand and lots of questions to supplement the theory. For classical physics, never got the textbook, just used the lecture notes provided which provided all that's needed.
Don't bother with a separate textbook for relativity, the quantum book covers what you'd need - that book is a good one for the quantum stuff as the set questions come from there.
So you are recommending:
- Introduction to Thermal Physics - Schroeder, D
- Modern Physics - Serway & Moses
Also how much does the lab stuff cost? Obviously I'll need two of those manuals and two lab books (last year it was $20 for a manual and the book - first year physics).
Also what do you want to do after your bachelor degree and what third year subjects did you pick this year?
Thanks for your help.
Post by: mark_alec on February 13, 2010, 12:42:32 am
So you are recommending:Yes, I am recommending those two and can sell you the first one (still in very good condition).
- Introduction to Thermal Physics - Schroeder, D
- Modern Physics - Serway & Moses
Quote
Also how much does the lab stuff cost? Obviously I'll need two of those manuals and two lab books (last year it was $20 for a manual and the book - first year physics).Yeah, it is $15 for the manual (though you can print it out yourself, not sure if that will be cheaper) and $5 for the report book - $20/semester.
Quote
Also what do you want to do after your bachelor degree and what third year subjects did you pick this year?I aim to undertake an MSc in physics. My third year science subjects are: quantum physics, electrodynamics, statistical physics, complex analysis, metric & hilbert spaces and partial differential equations.
Post by: QuantumJG on February 13, 2010, 12:55:32 am
So you are recommending:Yes, I am recommending those two and can sell you the first one (still in very good condition).
- Introduction to Thermal Physics - Schroeder, D
- Modern Physics - Serway & MosesQuoteAlso how much does the lab stuff cost? Obviously I'll need two of those manuals and two lab books (last year it was $20 for a manual and the book - first year physics).Yeah, it is $15 for the manual (though you can print it out yourself, not sure if that will be cheaper) and $5 for the report book - $20/semester.QuoteAlso what do you want to do after your bachelor degree and what third year subjects did you pick this year?I aim to undertake an MSc in physics. My third year science subjects are: quantum physics, electrodynamics, statistical physics, complex analysis, metric & hilbert spaces and partial differential equations.
How much would you be offering the thermal physics textbook for?
Post by: mark_alec on February 13, 2010, 01:30:47 am
How much would you be offering the thermal physics textbook for?$55 (just over half what it is new).
Post by: QuantumJG on February 13, 2010, 08:44:28 am
How much would you be offering the thermal physics textbook for?$55 (just over half what it is new).
Would I be able to buy it off you on the 23rd (when O-week starts)?