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# The Physics PHYA2 thread! 5th June 2013 Watch

• View Poll Results: What mark do you think you got out of 70?
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1. (Original post by Claree)
Thanks!!! I understand now
That is exactly what I said. ??? I am guessing you are still stuck. Ask again if you are.
2. (Original post by Jimmy20002012)
This is a really stupid question but what are the rearrangements of the dsintheta=nlambda?

Posted from TSR Mobile
dSinTheta/n=lambda
dSinTheta/lambda=n
Sintheta=Nlambda/d
d=nlambda/SinTheta
think those are right
3. (Original post by jasmintaa)
can someone please tell me how many significant figures we're meant to go to? Physics is so vague
2 s.f. unless asked to give an appropriate s.f. which in that case you use the question to see how many s.f. they gave there figures to.
4. (Original post by masryboy94)
2 s.f. unless asked to give an appropriate s.f. which in that case you use the question to see how many s.f. they gave there figures to.
Thank you
5. (Original post by masryboy94)
2 s.f. unless asked to give an appropriate s.f. which in that case you use the question to see how many s.f. they gave there figures to.
2, don't they normally do 3?
6. (Original post by Qari)
2, don't they normally do 3?
nope its always been 2, well from ALL the past papers i've done, i've seen them ask it to be in 2 s.f.
7. (Original post by StalkeR47)
That is exactly what I said. ??? I am guessing you are still stuck. Ask again if you are.
Yeah, but some people don't understand wording. Just show them the equation and it's a whole lot simpler. that's how I understand majority of the time
8. (Original post by Qari)
2, don't they normally do 3?
ermagerd I dont know, I do all mine to 3 and then theyre always 2 Im confused
9. Not feeling as confident as I would like right now... But I suppose we will just see how it goes :P Good luck for tomorrow everyone!
10. (Original post by jasmintaa)
dSinTheta/n=lambda
dSinTheta/lambda=n
Sintheta=Nlambda/d
d=nlambda/SinTheta
think those are right

Posted from TSR Mobile
11. (Original post by jasmintaa)
ermagerd I dont know, I do all mine to 3 and then theyre always 2 Im confused
word of advice, stick to 2 !
12. (Original post by masryboy94)
nope its always been 2, well from ALL the past papers i've done, i've seen them ask it to be in 2 s.f.
I think im gonna go for 2 and hope for the best
13. (Original post by masryboy94)
nope its always been 2, well from ALL the past papers i've done, i've seen them ask it to be in 2 s.f.

(Original post by jasmintaa)
ermagerd I dont know, I do all mine to 3 and then theyre always 2 Im confused
He's right, they're 2 s.f
14. (Original post by Jimmy20002012)

Posted from TSR Mobile
Wavelength is lambda
15. (Original post by masryboy94)
word of advice, stick to 2 !
Have you got Jan 13 paper?
16. What is the derivation of dsinO=nL
17. (Original post by Qari)
Have you got Jan 13 paper?
go to page 31 on this thread, post 602 by stalker
18. (Original post by jasmintaa)
I think im gonna go for 2 and hope for the best
Ok here is the rule! There will be only one question where they will test you on the significant figures. For the rest of the question, look at the quantity they have given you. EG, 3.2x10^7kg is to 2 sf. This means they are looking for 2 s.f. answers. Is that ok?
19. (Original post by Jimmy20002012)

Posted from TSR Mobile
wavelength is lambda so its the top one
20. (Original post by OliverG)
What is the derivation of dsinO=nL
what do you mean?

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