Edexcel Physics Unit 2 "Physics at work" June 2013 - Page 36 - The Student Room

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Year 12s: what will be the first way you research your future options? >>

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Original post by stealth_writer

Grade boundries estimates for the A guys?

57-60

Original post by krisshP

Did you do that as well? Look at post 685, that's how I figure it out. They expected you to be so cunning.

i memorized all wavelengths so im pretty sure its UV

Original post by hamzeh h

57-60

Is that high compared to usual?

Original post by hamzeh h

i memorized all wavelengths so im pretty sure its UV

Wow!

What did people put for the effect on the current if you double length and area?

Original post by krisshP

Is that high compared to usual?

ya kinda of june 2012 it was 51 , january 2013 it was around 55 january 2010 it was 45 ( but that was weird) , usually in low 50's

Original post by stealth_writer

What did people put for the effect on the current if you double length and area?

the MCQ ? it was V/2 since length had nothing to do with it

what did u guys put for the refractive index graph??? :eek:

:eek:

Original post by krisshP

Wow!

its pretty easy my teacher wrote them
in a way so we can memorise it :P

Original post by hamzeh h

the MCQ ? it was V/2 since length had nothing to do with it

It's V/4 if you double length the number of charge carriers increase also

Original post by Freddy-Francis

what did u guys put for the refractive index graph??? :eek:

:eek:

vary the angles
plot a sin(I) on y -axis and sin r on x-axis graph
The gradients would be the refractive index since
refractive index = sin i/sin r

What about Q8 for the MCQ?

Original post by ALevel96

It's V/4 if you double length the number of charge carriers increase also

thats what many people though but charge carrier is the amount of charge per unit volume so its a property of material

Original post by hamzeh h

its pretty easy my teacher wrote them
in a way so we can memorise it :P

You must have an amazing teacher then. Mine said that at critical angle, total internal reflection occurs WTF

Original post by stealth_writer

What about Q8 for the MCQ?

it was A

If you double the length the number of charge carriers doubles too! There's no two ways about it

Original post by krisshP

You must have an amazing teacher then. Mine said that at critical angle, total internal reflection occurs WTF

haha he has a PHD in physics he is pretty good wow hahaha a refraction at angle of 90 to the normal occurs at critcial angle and beyond it total internal reflection occurs

Q3 MCQ?

Original post by ALevel96

Q3 MCQ?

That was D

Original post by ALevel96

If you double the length the number of charge carriers doubles too! There's no two ways about it

Are you sure ..?

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