Physics Unit 4 6PH04 2016 Exam Discussion Thread

This poll is closed

Grade Boundary Estimate (For A)

65-70 24%

60-65 55%

55-60 21%

50-55 0%

45-500%

Total votes: 78

extreamedice

How did it go? I thought it was much easier than previous years!

*This is for edexcel GCE not IAL.

Reply 1

Bellbird

Yea everything were pretty much asked in previous years paper, but I'm a bit unsure for the particle detector q, what did u get for part 2- diffraction one and 4- how the ionized hydrogen atom leaves no track?

Reply 2

XDGFX

For the diffraction one I got that the wavelength was basically the same as the crystal structure or whatever was stated earlier in the question, so I said that it would cause diffraction as the wavelength was about the same size.

For the ionised hydrogen I said that it did not move and so did not produce a track.

Reply 3

kyraaalm

What was everyone's % for the capacitor charge? Everyone in my class seemed to get something different... I got 33%

Reply 4

extreamedice

Original post by kyraaalm

What was everyone's % for the capacitor charge? Everyone in my class seemed to get something different... I got 33%

I got about 16.7 % ! not sure about that. and uh, did any of you use hc/lambda for the wavelength?

Reply 5

kyraaalm

Original post by extreamedice

I got about 16.7 % ! not sure about that. and uh, did any of you use hc/lambda for the wavelength?

Oh well, hopefully I've picked up some method marks!
Yep, you had to work out the velocity first and then sub it in

Reply 6

jjjzzz

Original post by kyraaalm

What was everyone's % for the capacitor charge? Everyone in my class seemed to get something different... I got 33%

33%as well . but I am not sure the shall we use Cmax as denominator or C when d=3.5mm......

Reply 7

Bellbird

i got 33.3 too :smile:

i did the (normal-extra )-(normal+extra)x100%/ (normal-extra)

Reply 8

jjjzzz

Original post by kyraaalm

What was everyone's % for the capacitor charge? Everyone in my class seemed to get something different... I got 33%

I think even we are wrong, we will still have 2 marks for working out Cmax and Cmin...

Reply 9

musahmad

Original post by jjjzzz

I think even we are wrong, we will still have 2 marks for working out Cmax and Cmin...

the question asked what was the maximum % decrease that could be allowed and so you only had to work out Cmin (@4.2mm) and compare it to the capacitance at 3.5mm, I remember getting an answer of 16.75%?

(edited 7 years ago)

Reply 10

callum9977

Original post by jjjzzz

33%as well . but I am not sure the shall we use Cmax as denominator or C when d=3.5mm......

33% too - I was unsure about what percentage they wanted us to find!

Reply 11

musahmad

How did you guys work out the radius of the cyclists' curvature? I tried Fsin(theta) = mg and Fcos(theta) = mv^2/r but that game an answer of 4.5 cm :argh:

Reply 12

AdamThePhysicsMo

I got 16.67% too!

I got 20m (ish) for the radius!

I screwed that 5 marker for momentum bad 😂

Whats everyone thinking for grade boundaries?

Reply 13

AdamThePhysicsMo

Original post by musahmad

How did you guys work out the radius of the cyclists' curvature? I tried Fsin(theta) = mg and Fcos(theta) = mv^2/r but that game an answer of 4.5 cm :argh:

I did tan (angle) x mg = mv^2/r