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AQA Physics Unit 1 PHYA1 20th May 2013

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We don't need to know about E=mc2, but it would still get you the answer, I was just pointing out, use it as a last resort, as it would work for the jan 13 question for example

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Reply 741

Tuya

What time do the exams start for you lot? It's a pm exam I believe

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Reply 742

Didierr

Find physics the hardest out of all of my sciences
I am very nervous!
Good luck to you all xo

Reply 743

StalkeR47

Maybe, 6 marker will be on energy level spectra...

Reply 744

Jackb1234

Original post by Tuya

What time do the exams start for you lot? It's a pm exam I believe

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1:00pm

Reply 745

StalkeR47

Original post by Tuya

What time do the exams start for you lot? It's a pm exam I believe

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Yes pm. But not sure about what time. maybe its at 1pm.

Reply 746

GeneralOJB

Will you need to do calculations for annihilation? If the particle and anti particle have kinetic energy, will that mean the photon energy is the rest energies + kinetic energies divided by 2?

Reply 747

StalkeR47

Original post by Didierr

Find physics the hardest out of all of my sciences
I am very nervous!
Good luck to you all xo

Very good luck to you too!!!! :wink:

Reply 748

StalkeR47

Bye all!!! It 11pm and I am going to bed for tomorrow! :smile:

Have a good night sleep and do not worry at all about the exam if you revised for it. :smile:

Reply 749

Namige

Original post by GeneralOJB

Will you need to do calculations for annihilation? If the particle and anti particle have kinetic energy, will that mean the photon energy is the rest energies + kinetic energies divided by 2?

Yes, as there is 2 photons created to conserve momentum - going in opposite directions.

Reply 750

Tuya

When is discussion legal? As its not edexcel, I'm guessing straight away

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Reply 751

StalkeR47

Original post by GeneralOJB

Will you need to do calculations for annihilation? If the particle and anti particle have kinetic energy, will that mean the photon energy is the rest energies + kinetic energies divided by 2?

Yes! you could be asked to calculate annihilation energy. rest energy is 0.510999MeV for a single electron. What do you mean by divided by 2? only add the energies together.

Reply 752

Jackb1234

Original post by Tuya

When is discussion legal? As its not edexcel, I'm guessing straight away

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I believe so!

Good luck ALLLL!

Good luck guys! :biggrin:

Original post by Tuya

When is discussion legal? As its not edexcel, I'm guessing straight away

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Yup, straight away. :biggrin:

Reply 755

GeneralOJB

Original post by StalkeR47

Yes! you could be asked to calculate annihilation energy. rest energy is 0.510999MeV for a single electron. What do you mean by divided by 2? only add the energies together.

Well since two photons are emitted, the energy of one photon would be half.

Reply 756

x-Sophie-x

Original post by StalkeR47

Yes! you could be asked to calculate annihilation energy. rest energy is 0.510999MeV for a single electron. What do you mean by divided by 2? only add the energies together.

So for annihilation, its the rest energy for the particle. So approx 0.5mev.

But for pair production you double it so approx 1.02mev?

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Reply 757

Declan_Brennan

Original post by StalkeR47

Yes! you could be asked to calculate annihilation energy. rest energy is 0.510999MeV for a single electron. What do you mean by divided by 2? only add the energies together.