UKL Physics Society (UKL PhySoc) Watch

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[_Z_]
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#261
Report 15 years ago
#261
Can i become a member....?
I am currently doin A level in physics... plan to do either Comp Sci. or Physics at uni.
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Hoofbeat
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#262
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#262
(Original post by kiranv)
Hello i'm doin Physics (F303) at imperial this Sept. I am holding a firm offer from them.

Count Me in.

Cheers,

Kiran
sure! (btw, did u go to an "interview" @ imperial in dec. i just mite have met u there! lol)
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Hoofbeat
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#263
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#263
(Original post by [_Z_])
Can i become a member....?
I am currently doin A level in physics... plan to do either Comp Sci. or Physics at uni.
sure to u too!
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kiranv
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#264
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#264
Hoofbeat,

I attended the interview on friday 30th Jan 04.

Cheers.
Kiran.
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Resonance
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#265
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#265
I'm doing A2 Physics, and it's my favourite subject. Can I join?
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RobbieC
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#266
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#266
I would be interested in joining. I am applying to do Natural sciences at Cambridge next year, and want to specialise in Astrophysics. Could I join?
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Kupo_nut
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#267
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#267
Can I join too? I posted in the members list thing the other day too - i duno where I'm meant to go to join though!

I'm hopefully going to read physical NatSci at Cambridge in October. So... lemme in!
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yusufu
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#268
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#268
can i join? i'll be doing physics AS next year and i do separate physics gcse at the moment.
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need_help
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#269
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#269
Hey, hoping that someone is good enough at phsyics to be able to help.

A question came up on the PSA4 paper for Salter Hornor physics that i'm still confused about and even my teachers seem a bit confused about.

The question was quite complicated and i can't remember all the detail. Basically imagine a CD case. The top side being made of a shiny, reflective metal surface and the bottom side being made of a dull surface.

The question basically asked which side will absorb more energy when a photon impacts with it and therefore in which direction will the resultant force be?

I said that the shiny side would absorb the photon (thinking of the photoelectric effect) and therefore have the most energy transfered to it. The resultant force would therefore be down.

At the time i was unsure about this as i was thinking about elastic and inelastic collisions. Because it said shiny, 'reflective' material i thought that the electron would bounce of this side in an elastic collision and transfer no energy. The dull side would absord energy in an inelastic collision and have energy transfered to it. Therefore the resultant force would be up.

After speaking to my teachers today, they tried to relate momentum equations to it to work out the resultant energy and force.

Anyone do this question or have any idea what the anwser could be. Anyone know what is more likely or have a suggestion?
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Fledge
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#270
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#270
Can I join
Im currently doin A level physics I plan to do Physics or Engineering at uni
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lucent
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#271
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#271
Can I join? I'll be doing physics at Imperial next year too (grades permitting).
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john !!
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#272
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#272
Maybe the three societies should be put as stickys, as they are the 3 subjects of this forum.
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Nylex
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#273
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#273
If you guys hadn't realised, there's now a Biology/Chemistry/Physics subforum under Universities > Courses, too.
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john !!
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#274
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#274
(Original post by Nylex)
If you guys hadn't realised, there's now a Biology/Chemistry/Physics subforum under Universities > Courses, too.
I think they're overdoing it with that - that's just repetition! Why would people bother to check two forums? :confused:
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Nylex
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#275
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#275
(Original post by mik1a)
I think they're overdoing it with that - that's just repetition! Why would people bother to check two forums? :confused:
I guess this one's for problems with questions and stuff and the other one's for university discussion (just a guess though).
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sumi2000
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#276
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#276
Can i join too pls...i'm doin my A2 Physics Edexcel now...
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chellie
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#277
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#277
Love physics, starting an MPhys in Physics with Astrophysics at Leicester this september. (If I get my grades):cool:
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Nylex
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#278
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#278
(Original post by chellie)
Love physics, starting an MPhys in Physics with Astrophysics at Leicester this september. (If I get my grades):cool:
Yay, another astrophysicist .
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Hoofbeat
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#279
Report Thread starter 15 years ago
#279
(Original post by sumi2000)
Can i join too pls...i'm doin my A2 Physics Edexcel now...
you planning to do Physics (or related course @ uni), just so I know what membership categorary to put you under?! Then I'll add you to members list!
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DazYaRRR
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#280
Report 15 years ago
#280
(Original post by need_help)
Hey, hoping that someone is good enough at phsyics to be able to help.

A question came up on the PSA4 paper for Salter Hornor physics that i'm still confused about and even my teachers seem a bit confused about.

The question was quite complicated and i can't remember all the detail. Basically imagine a CD case. The top side being made of a shiny, reflective metal surface and the bottom side being made of a dull surface.

The question basically asked which side will absorb more energy when a photon impacts with it and therefore in which direction will the resultant force be?

I said that the shiny side would absorb the photon (thinking of the photoelectric effect) and therefore have the most energy transfered to it. The resultant force would therefore be down.

At the time i was unsure about this as i was thinking about elastic and inelastic collisions. Because it said shiny, 'reflective' material i thought that the electron would bounce of this side in an elastic collision and transfer no energy. The dull side would absord energy in an inelastic collision and have energy transfered to it. Therefore the resultant force would be up.

After speaking to my teachers today, they tried to relate momentum equations to it to work out the resultant energy and force.

Anyone do this question or have any idea what the anwser could be. Anyone know what is more likely or have a suggestion?
The shiny side should reflect more photons than the dull side, but if the photons bounce off it elastically 2 x the momentum of the photon will be transferred. The dull side, when a photon is absorbed recieves only the original momentum, half that of the shiny side. So I think the resultant force will be downwards, except not for the same reason.
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