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Edexcel Phy4 Exam Today

Hey...

Just got out of the exam... how did ppl find it...?? i thought it wasnt too bad... surprised there wasnt much on E=hf and there was no de broglie question...

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Reply 1

lookenneth

Oh? Safe to talk abt it adi?

Reply 2

proffnaz

I made some stupid mistakes... can people post there answers because im too embrassed to post mine :redface:

.
Hope everyone did well in the exam, best of luck if u have remaining exams.

-Naz

Reply 3

Retardant_Snail

Was a pretty good paper i thought :smile:

Reply 4

r4mzy

did any1 get 1.37eV as the kinetic energy...?? also the last question.. i got the radius as 74.5m and the force as 0.077N...??

Reply 5

damaster275

r4mzy

did any1 get 1.37eV as the kinetic energy...?? also the last question.. i got the radius as 74.5m and the force as 0.077N...??

i got 2.2*10^-19 j so i guess we're right and yep i also got 74.5 and 0.077N :biggrin:

Erm what did you guys write for the assumption for the first question about age of universe? That was about the only one i couldnt do.

Reply 6

kenobi124

1.4eV was my kinetic energy....
I got radius as 486 (or 483) forgot....
Force as 0.0012 or 0.012 (dunno if I'm right)
What was the forces that acted at point B on the London Eye?

OKAY.... CONFIRMATION... I'M WRONG!!!
DAMMIT
I just calculated it again....
What's wrong wiv me lately?

Reply 7

damaster275

kenobi124

1.4eV was my kinetic energy....
I got radius as 486 (or 483) forgot....
Force as 0.0012 or 0.012 (dunno if I'm right)
What was the forces that acted at point B on the London Eye?

normal reaction and gravitational force?

Reply 8

grotto

Assumption: galaxies are moving from a point and the individual velocities do not vary.

Reply 9

jellyb07111

r4mzy

did any1 get 1.37eV as the kinetic energy...?? also the last question.. i got the radius as 74.5m and the force as 0.077N...??

yup ..same as urs... XD

Reply 10

r4mzy

i just wrote gravity and tension... (wasnt sure bout the tension)... the assumption.. cudnt fink of anything so just wrote... u assume hubbles constant does not change... :confused:

Reply 11

kenobi124

damaster275

normal reaction and gravitational force?

I wrote Weight and Centrifugal force....
Don't know if that's right...

--------------

grotto

Assumption: galaxies are moving from a point and the individual velocities do not vary.

My assumption: That all the galaxies originated from a singularity and that the recession velocities of the galaxies are not accelerating...

Reply 12

r4mzy

what did ppl write for the value of X.... i wrote 10exp-10metres

Reply 13

damaster275

r4mzy

what did ppl write for the value of X.... i wrote 10exp-10metres

i put 10^-8 lol because its in between 10^-7(UV) and 10^-10(x-ray)...

Reply 14

kenobi124

r4mzy

what did ppl write for the value of X.... i wrote 10exp-10metres

oh great.... i got the order of them wrong.... I put gamma rays before X-rays.... I'm good gamed... it is supposed to be 10^-10 but i don't know why i wrote 10^-12

Reply 15

gfdsa

u do know that centrifugal force is not actually a force. It does not exist but people think its an actual force

Reply 16

r4mzy

i was gonna put that in but thrt i mite aswell put 10exp-10 in instead... nwy i thrt question 6 was well easy... it was bout resonance occuring when the waves are the same frequency as the natural frequency of the tower.... i hopeee.. :confused:

Reply 17

kenobi124

gfdsa

u do know that centrifugal force is not actually a force. It does not exist but people think its an actual force

I didn't think writing normal reaction force would get me the mark, but centrifugal force was all i could think of....
oh well..... i'm ready to retake.... don't mind

Reply 18

proffnaz

lol i thought it was in decending order of frequency so for X i got microwaves and i wrote down 10^-3. They should have made that more clear, and for the assumption for the first question i wrote down that we (observer) and in the middle of the universe so the radius is equal in all directions.