Physics: OCR A G482 Electrons, Waves and Photons - 4/06/15

around 72-75 I believe depending on the difficulty of the paper.

out of 100? so i can lose like 15 MARKS WHAT YES THANK THE LORD

ill still lose like 30 though ahahahah

No, that's crazy. For last year it was 59 i think


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Last year was a LOL paper usually though its around that region. Damn i hope they take it easy this year i cried last year in that exam.

Guys how do I explain interference and intensity? I know the gist of it but I'm unsure as to how to word it.

Yeah i need to do that or just babble on, what do you guys think is going to come up?

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1c/ Work out the current of the lamp using fig1.1 by going to 6V and this gives you 250x10-3A or 0.25A.
Then use v=IxR rearrange and work out the current of the resistor which is 6/20= 0.3A. Add them together that should give you 0.55A.

D) So for then you draw an IV characteristic graph with 6V corrosponding to your value of 0.3A however you need to convert it in to mili amps which would be 300X10-3A.

Then the last part tbh i have no clue wtf they are on about i know that in series current is the same. Oh yeah i remember both components have to add up to 6V So each has 3V each. go to fig1.1 remeber in D ii you drew a new line ending at 300x10-3A or 0.3A at 6V. You should have two lines on your graph and then go to 3V where they should intersect and have a value for the current.

Last year for this syllabus, they probably want to go off with a bang
OCR, please have mercy on our souls.

Waves superpose if it is stationary wave they superpose with reflected wave.
Areas of maximum amplitude high intensity have a phase difference of nlambda
Areas of minimum amplitude low intensity have a phase difference of (2n+1)lambda/2
Its all about phase difference but usually they want you to answer with this type of style ish .

thanks pal! i always struggle with circuit calculations do you have any standard tips or tricks on how to start working them out?

I ran out of reps but thank you!

I would recommend revising Electron Diffraction also

Accelerate electrons through a vacuum
they then diffract through graphite crystal
producing rings
rings are known as interference patterns
we know that diffraction and interference patterns are ideas that light is a wave
so this experiment proves it
rings are wider with slower velocity so we use a smaller p.d as EV is 05.mv(2)

Excellent will definitely re read that.

Good Luck All

Hopefully OCR will be more considerate after the rubbish paper I sat last year

No problem, remember they need to be coherent as in constant phase difference for this to occur. Same intensity as well.