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AQA Physics AS exam 24th MAY and 9th JUNE 2016 (Thread)

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1700m (2.s.f) distance travelled by plane, anyone ?
Reply 161
Avatar for Akashi
Akashi
5
Original post by money-for-all
1700m (2.s.f) distance travelled by plane, anyone ?


I got around 850 I think since using the SUVAT with + 2as you had to divide by 2.
Original post by money-for-all
1700m (2.s.f) distance travelled by plane, anyone ?


How did you get that answer? What did you get for deceleration on the question before that?
Original post by money-for-all
1700m (2.s.f) distance travelled by plane, anyone ?


No I got like 800 and something. Deceleration was like 2.7, v=0 and u=68

(0-68^2)/(2x-2.7) rearranging v^2 = u^2 + 2as to (v^2 - u^2)/2a
Original post by anishnaik
How did you get that answer? What did you get for deceleration on the question before that?


i got 2.7
Reply 165
Avatar for Akashi
Akashi
5
What did everyone get for the last 4 marker (the energy of the photons emitted as a result of annihilation)?
Someone make an unofficial markscheme please
someone send markscheme
Original post by Akashi
What did everyone get for the last 4 marker (the energy of the photons emitted as a result of annihilation)?


Converted MeV to eV (which is MeVx10^6) then converted that to Joules. Then I just rearranged E=hf and got the frequency.
Reply 169
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Akashi
5
Original post by babyetu
Converted MeV to eV (which is MeVx10^6) then converted that to Joules. Then I just rearranged E=hf and got the frequency.


Yup, I got something to the x10^23 I think. Felt a bit big so was unsure.
Yeah pretty sure mine was to the same power.
Reply 171
Avatar for tsr1998
tsr1998
Why do 2 photons have to be created instead of just 1 during annihilation? I talked about conservation of energy and momentum, but not sure if it's right.
Original post by money-for-all
1700m (2.s.f) distance travelled by plane, anyone ?


I got 1700 something yea
Original post by Akashi
Yup, I got something to the x10^23 I think. Felt a bit big so was unsure.


think u also have to convert MeV to Joules
Reply 174
Avatar for Akashi
Akashi
5
Original post by tsr1998
Why do 2 photons have to be created instead of just 1 during annihilation? I talked about conservation of energy and momentum, but not sure if it's right.


Don't think energy has any relevance since it's conserved in a single or dual photon.
I talked about momentum is conserved and about that they have to go in the opposite direction at the same speeds as the colliding particles did or something along the lines of that.
Original post by kylepinto123456
I got 1700 something yea


are you being honest , if so , then high five bruh !!!

everyone else getting 800 pfft....
Original post by tsr1998
Why do 2 photons have to be created instead of just 1 during annihilation? I talked about conservation of energy and momentum, but not sure if it's right.


I said because certain factors such as baryon number and charge have to be conserved so an antiparticle is created etc. etc.
Original post by kylepinto123456
think u also have to convert MeV to Joules


That is after conversion...
Reply 178
Avatar for Akashi
Akashi
5
Original post by money-for-all
are you being honest , if so , then high five bruh !!!

everyone else getting 800 pfft....


v^2 = u^2 + 2as

v = 0
u = 68
a = -2.7

-(68^2)/2x-2.7 = s

s = 856.296
= 8.6 x10^2 (2 s.f.)
I got 0.06A for a current on one questions and 0.15 ohms for the value of a resistor, anyone get these?

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