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

Reply 480

hosamthemaster

1

Guys look what I found all the grade boundries !!!

DONT BE SCARED THEY ARE QUITE LOW GOOD LUCK

Love you all !!!!

Reply 481

FaisalTreShah

2

Original post by Joseph-

anybody know a good way of remembering order of wavelength in electromagnetic spectrum?

Red Minicoopers In Venice Use Extra Gas. :smile:

Reply 482

Liberty.

10

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.

Reply 483

Dizzie31

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

Reply 484

scientific222

13

Bloody hell it was 56/100 for an A in Jan 2010!!? There is hope, there is hope.

Reply 485

Liberty.

10

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 :rolleyes:

Reply 486

hosamthemaster

1

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 !!!! :colone:

exam !!!

Reply 487

harsh.boy365

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! :s-smilie:

Reply 488

scientific222

13

Could someone help me for this? part ii) that is

Reply 489

yodawg321

12

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?

Reply 490

scientific222

13

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?

Reply 491

Taffie

Can someone explain to me question 3a in June 2012. http://www.ocr.org.uk/Images/131308-question-paper-unit-g482-electrons-waves-and-photons.pdf

Posted from TSR Mobile

Reply 492

Supes180

6

So what's with the new specification? On the OCR website it indicates it's been changed somehow...Anything extra to revise for?

Reply 493

JG1027

can someone explain malus's law again what does theta actually mean?

Reply 494

viyas07

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

Reply 495

Supes180

6

Original post by Taffie

Can someone explain to me question 3a in June 2012. http://www.ocr.org.uk/Images/131308-question-paper-unit-g482-electrons-waves-and-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.

Reply 496

JG1027

so the theta means the angle of polarising filter and light?

Reply 497

Liberty.

10

I finally did well in Mechanics now it'll all get pooped-up because of this darn unit :cry2:

I never stay up this late before an exam, it tells you something!

Reply 498

Jonma

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.