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TSR Physics Society

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Reply 20

F1 fanatic

Why does my name no longer appear on that list when I'm sure it did at one point? :confused:

Reply 21

jpowell

AlphaNumeric

I'm up for joining too. Is it just a matter of saying, or do you have to answer a question like in the maths one?

No you don't need to answer a question. Unless you'd like one that is :tongue:

Reply 22

F1 fanatic

AMM

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F1 fanatic

Thankyou

Reply 23

the_cubbard

Hey can i join. Physics A-level, and loving it!!

Reply 24

AlphaNumeric

AMM

No you don't need to answer a question. Unless you'd like one that is :tongue:

Lol, no, I'm quite alright with the two example sheets I got in lectures this morning thanks very much :p:

Thanks for updating the list :smile:

Count me in

Physics dilemma. I posted this in one of the threads. But nevertheless:

On a sub-atomic level every single particle has an anti-particle. If the two come together and collide with enough energy, they annihilate each other and give out energy in the form of gamma rays. If that is the case, I sometimes wonder of the existence of anti-particles that make up an "anti-me" in a parallel universe. And if such an "anti-me" exists, I wonder if annihilation would occur if we collide with sufficient energy. I would exist as energy :eek:

. I mean it is possible, if it exists, because energy and mass are equivalent. And all matter has mass. Hmmm.

Reply 27

Robob

jkwong_11

. I mean it is possible, if it exists, because energy and mass are equivalent. And all matter has mass. Hmmm.

'You' would become energy, but 'you' would no longer exist (well i dont believe in a soul)

Reply 28

AlphaNumeric

e11even

On a sub-atomic level every single particle has an anti-particle.

Photons, gravitons and Z⁰ particles don't have anti-particles.

e11even

And if such an "anti-me" exists, I wonder if annihilation would occur if we collide with sufficient energy.

Particles and anti-particles don't have to have sufficent energy to annihilate, they will destroy one another if they meet at any energy.

Reply 29

ApeXaviour

Any chance I could join?

3rd undergraduate Physics student.

Reply 30

Ana

If we want to be listed when they start accepting new socs again, we'll need a new icon.

Any bright sparks (hoho) got any good designs?

Reply 31

NeilosRobbos

Hmm, I would like to be a member. I'm a current upper Sixth student, who will be going into a degree in physics next year.

can I join toooo??

id like to join thanks

Reply 34

Comp_Genius

AlphaNumeric

Photons, gravitons and Z⁰ particles don't have anti-particles.
Particles and anti-particles don't have to have sufficent energy to annihilate, they will destroy one another if they meet at any energy.

The antiparticle of a photon it a photon. :p:

Reply 35

AlphaNumeric

darkenergy

The antiparticle of a photon it a photon. :p:

Well I think it depends on your particular convention. The particles I listed have antiparticles, themselves, so does that mean they actually have antiparticles? After all, there is a sea of gravitons and photons around us right now, so they can interact.

If two photons collide and emit two photons, did they annihilate one another (like an electron/positron collision would) or did they just interact and go their seperate ways? Depends on how you want to think about it, you'll get the same answer either way.

QED does predict that gamma-gamma collisions can initiate pair production (create matter/antimatter pairs). The team working on the LHC at CERN is thinking about possible ways to modify some experiments to look for evidence of such interactions. The problem the cross section for such reactions is incredibly small, even compared to the cross sections for lepton or baryon collisions.

Reply 36

Comp_Genius

emm... my physics is rather weak :smile:

but when they collide different photons are formed so they annihilated each other?

Reply 37

Dhesi

Im studying higher physics and really enjoying it. Can I join :smile:

Mike

Reply 38

i_luv_maths

can i join as well please? i'm doing physics As level and i'm really enjoying the subject. My other infos are below:

Reply 39

AlphaNumeric

darkenergy

emm... my physics is rather weak :smile:

but when they collide different photons are formed so they annihilated each other?

The thing is, can you definitely tell me they have annihiliated and then produced two entirely new photons, or have they just interacted, altering some of their characteristics? Given these characteristics are all you can know about photons, it doesn't matter which mechanism you think is true, the outcome is the same :smile: