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AQA physics B exercise 1

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Reply 20
Avatar for tanc
tanc
r_perry> what circuit was it? i dont understand? c=e^(log10 (c))??? what is c? intercept or capacitance???

help!!! my exam is tomorrow!!!

Note: LED's do induce a voltage when light is neared it. We were told we wont need to know the concept. But something to do with electron carriers, like LDRs
Reply 21
Avatar for r_perry
r_perry
tanc
r_perry> what circuit was it? i dont understand? c=e^(log10 (c))??? what is c? intercept or capacitance???

help!!! my exam is tomorrow!!!

Note: LED's do induce a voltage when light is neared it. We were told we wont need to know the concept. But something to do with electron carriers, like LDRs


Its just about moving a light nearer an led, u dont really need to know anything else. c is sumthing in an equation they give you. I basically used inverse log of base e when it was in base 10. so my answer was about 50 and it should have been about 8500
Reply 22
Avatar for green_eyes
green_eyes
OP
1
mine was ok i think - though our class got a whole range of values for c varying from 10 to 800! hmm. thought it was quite straightforward though!
Reply 23
Avatar for ryan750
ryan750
2
my exam was ok - apart from we had to start it all over again after 15 minutes of doing it - he gave us the wrong ammeters. then my ammeter didnt work properly - and nor did my l.e.d. so he replaced them - then my ammeter still didnt really work - so i masde up my results pretty much. i realised it was a inversely p[roportional relationship because of the intensity of light. i answered the question about how the voltage was induced with too much detail i think - and the detail was probably wrong. i was really pissed after it - my exam was just ****ed up. oh well - there is always exercise 2 :frown:
Reply 24
Avatar for ryan750
ryan750
2
can i ask evry1 wot their gradients were - i think mine was sumthing like -1.2
Reply 25
Avatar for swishmasta
swishmasta
how come you guys had your pratical early, isnt it on the 25 may for everyone?
Reply 26
Avatar for sunnysmile
sunnysmile
my practical is on next week! i am desperate for help! may i know if we will be asked to connect the circuit??
Reply 27
Avatar for green_eyes
green_eyes
OP
1
everything is set up for you. apart from knowing a little bit about voltages and semiconductors there isn't alot of preparation you can do!
ryan750 - i got about -2.2 for my gradient which about ties in with the inverse square law thing. i can't believe your teacher mucked you around so much! that is really unfair! im really hoping exercise 2 goes ok too - i don't think i will pass unit 5 because i can't do any of the past papers! eekkk!
Reply 28
Avatar for anna_k
anna_k
I have my practical tomorrow - eek! I'm glad everyone else is pretty clueless like me! :confused: :smile:

Does anyone know what the practical that isn't about LEDs is on, cos I have to do them aswell?
Reply 29
Avatar for swishmasta
swishmasta
looking at the past papers i have noticed SHM is a common topic. Circuits of some sort have also been popping up all the time except 2002. Molecular kinetic theory stuff came up once in june 03 and heat & working stuff alos came up once in june 04. Stress/strain young modulus etc has come up twice.

i think the experiments this year will most likely have some SHM , and we also know from the pre-release material we got some circuits.
Reply 30
Avatar for swishmasta
swishmasta
how did u guys do on excersise 2, i think it was aight, pretty fair.

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