Physics P-22 GT.

[zaidwaseem]

dont actually remember.. but couldnt find percentage uncertainity :/

 

[hellblender]

Was a screw up for me, i prioritised my other subjects so i guess i deserve it. Blanked out in the electricity section. Honestly, the paper wasn't that difficult, 2 weeks of solid revision would easily get you an A. Hope you guys did well.

after S1 on 22nd, we have 19 days to prepare for the MCQ. Gonna go all out for that one. Hammer and tongs.

 

[Snowysangel]

i think increases the p.d cuz the current decreases but i dont remember

Did it ask about the fixed resistor or the variable resistor? Cause I wrote that it increasse because the increase in resistance is greater than the decrease in current, but if it asked about the fixed resistor this is pretty much a zero

 

[Snowysangel]

dont actually remember.. but couldnt find percentage uncertainity :/

It was 76 point something percent

 

[Princess Raven]

It was 76 point something percent

woah i got 6.6%

 

[Princess Raven]

Did it ask about the fixed resistor or the variable resistor? Cause I wrote that it increasse because the increase in resistance is greater than the decrease in current, but if it asked about the fixed resistor this is pretty much a zero

i think it asked to show what happened to voltage across y.. when variable resistor increases... i decreases since resistance across AB increases so a greater proportion of the voltage goes to AB and thus less amount of voltage goes across y

 

[Princess Raven]

2:1 tho not entirely sure

aw man i got 1:2

 

[Snowysangel]

i think it asked to show what happened to voltage across y.. when variable resistor increases... i decreases since resistance across AB increases so a greater proportion of the voltage goes to AB and thus less amount of voltage goes across y

It decreases because the current decreases...they asked us tobeefervto the graph...and V=IR...but it was just two marks and the thresholds usually really low so I do t care

 

[Snowysangel]

woah i got 6.6%

Did you convert everything to the SI unit? The volume of the cylinder had a really big percentage uncertainty because if which so did the density. The absolute uncertainty was 800

 

[Princess Raven]

Did you convert everything to the SI unit? The volume of the cylinder had a really big percentage uncertainty because if which so did the density. The absolute uncertainty was 800

yea i got the absolute uncertainty as 825 as well.. then its 6.6% for sure coz i did it like 3 times

 

[Princess Raven]

It decreases because the current decreases...they asked us tobeefervto the graph...and V=IR...but it was just two marks and the thresholds usually really low so I do t care

oh well atleast one of us will get one mark for saying it decreases

 

[unique111]

yea i got the absolute uncertainty as 825 as well.. then its 6.6% for sure coz i did it like 3 times

lol I did it thrice too! And didn't have enough time to complete waves
Btw how did you calculate the strain ratio? What did the question imply by saying the wires were made with same material?

 

[Snowysangel]

yea i got the absolute uncertainty as 825 as well.. then its 6.6% for sure coz i did it like 3 times

Are you sure? What was your density?

 

[Snowysangel]

lol I did it thrice too! And didn't have enough time to complete waves
Btw how did you calculate the strain ratio? What did the question imply by saying the wires were made with same material?

That their young modulus was the same

 

[Snowysangel]

oh well atleast one of us will get one mark for saying it decreases

I wasn't talking about you...the 'I' don't care part aptly underlines that point :/

 

[unique111]

Oh okay.

That their young modulus was the same

And the last waves question, was it asking about red light or blue? I forgot. Anyway, what's the answer?

 

[Princess Raven]

Are you sure? What was your density?

1.25*10^4

 

[Princess Raven]

Oh okay.

And the last waves question, was it asking about red light or blue? I forgot. Anyway, what's the answer?

u use red light so wavelength increases thus fringe separation increases and brightness decreases.. not sure though

 

[Snowysangel]

Oh okay.

And the last waves question, was it asking about red light or blue? I forgot. Anyway, what's the answer?

Red light. Larger wavelength so the angle of the Maximus and minimal would be larger and the fringe separation would also be greater

 

[Snowysangel]

1.25*10^4

I don't think I got that. I remember getting 2 point something x 10^4 :S do u remember the diameter and the thickness of the cylinder