# OCR Physics Unit 2 - G482 - (June Exams Preparation)Watch

Announcements
6 years ago
#481
Guys look what I found all the grade boundries !!!

DONT BE SCARED THEY ARE QUITE LOW GOOD LUCK

Love you all !!!!
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6 years ago
#482
(Original post by Joseph-)
anybody know a good way of remembering order of wavelength in electromagnetic spectrum?
Red Minicoopers In Venice Use Extra Gas.
2
6 years ago
#483
Jan 11
Q6 b) ii) Worked out the kenetic energy of the electron, need to work out the speed.
You're supposed to use 1/2mv^2, but isn't an electrons mass something like 1/1200, and the mark scheme is using m= 9.1x10^-31?
Baffled.
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6 years ago
#484
(Original post by Liberty.)
Jan 11
Q6 b) ii) Worked out the kenetic energy of the electron, need to work out the speed.
You're supposed to use 1/2mv^2, but isn't an electrons mass something like 1/1200, and the mark scheme is using m= 9.1x10^-31?
Baffled.
electron rest mass is 9.11x10^-31
its on the data sheet brah
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6 years ago
#485
Bloody hell it was 56/100 for an A in Jan 2010!!? There is hope, there is hope.
1
6 years ago
#486
(Original post by Dizzie31)
electron rest mass is 9.11x10^-31
its on the data sheet brah
Dayumm, completely forgot about that side of the sheet. Thanks
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6 years ago
#487
(Original post by scientific222)
Bloody hell it was 56/100 for an A in Jan 2010!!? There is hope, there is hope.
Imagine it is the same ! It should be a some sort of reallly hard x10 power 1000 !!!! exam !!!
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6 years ago
#488
i only prepared for bio then less for chem and nearly none for physics, tho somehow i got b in mock cant do it in past papers now!
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6 years ago
#489
Could someone help me for this? part ii) that is

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6 years ago
#490
(Original post by scientific222)
Could someone help me for this? part ii) that is

Is this answer Wavelength over 2 or (2n+1)/2 * wavelength?
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6 years ago
#491
(Original post by yodawg321)
Is this answer Wavelength over 2 or (2n+1)/2 * wavelength?
The MS says this ii) 6 x (2n + 1)/2 x10-7 (m) where n = 0, 1,2, etc.
EDIT: your answer looks right. Why did you multiply it by wavelength though?
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6 years ago
#492
Can someone explain to me question 3a in June 2012. http://www.ocr.org.uk/Images/131308-...nd-photons.pdf

Posted from TSR Mobile
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6 years ago
#493
So what's with the new specification? On the OCR website it indicates it's been changed somehow...Anything extra to revise for?
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6 years ago
#494
can someone explain malus's law again what does theta actually mean?
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6 years ago
#495
(Original post by JG1027)
can someone explain malus's law again what does theta actually mean?
i=I(zero in brackets) cos squared theta

the i zero in brackets is intensity of incident light

what it means is, the angle you have the polaroid or grid at determines the intensity coming out the other side.

hope tht helps
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6 years ago
#496
(Original post by Taffie)
Can someone explain to me question 3a in June 2012. http://www.ocr.org.uk/Images/131308-...nd-photons.pdf

Posted from TSR Mobile
Well, as the thermistor is heated, its resistance decreases. So this means total resistance in the circuit decreases. If resistance decreases, you can see with the equation V=IR, (I= V/R) current increases. This is because the electrons have less resistance to move against.
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6 years ago
#497
so the theta means the angle of polarising filter and light?
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6 years ago
#498
I finally did well in Mechanics now it'll all get pooped-up because of this darn unit
I never stay up this late before an exam, it tells you something!
1
6 years ago
#499
(Original post by Supes180)
Well, as the thermistor is heated, its resistance decreases. So this means total resistance in the circuit decreases. If resistance decreases, you can see with the equation V=IR, (I= V/R) current increases. This is because the electrons have less resistance to move against.
But if resistance decreases, shouldn't the ratio of resistance/voltage increase to the other component instead of the total resistance decreasing?
0
6 years ago
#500
Can someone explain E.M.F. vs P.D.?
0
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