Physics: Post your doubts here!

[anastasia grey113]

n do u think the threshold is ACTUALLY going to be higher than in 2017? did u guys find this paper easier than last year's?

 

[Minsa Fatima]

ik thaz wut made me draw the peaks in opposite directions
m still not sure y they were post to be in the same directions but many of my friends said that it was the gradient which had to be considered

If we consider sign of B and put it in formula that we used before to prove the voltage wont we get a negative value of voltage?
Are u sure your friends did it the right way?

 

[anastasia grey113]

If we consider sign of B and put it in formula that we used before to prove the voltage wont we get a negative value of voltage?
Are u sure your friends did it the right way?

no m not sure but idk they might be right
cuz the B was decreasing
it's not the value of B that matters but the change in B that does i think

 

[Minsa Fatima]

ok m a lil worried now
wut was the definition of bandwidth? i wrote 'the maximum signal frequency carried by a carrier wave x 2' is that right?
and like i dint mention the 'no increase in kinetic energy 'during melting...i just wrote abt increase in potential energy of particles
do u think there will be a mark for Ek as well?

IN the application booklet it is the range of frequencies occupied by a waveform. It would be the difference in max and min frequencies.
As for the other you might lose a mark for not explaining why there was no temp change

 

[anastasia grey113]

IN the application booklet it is the range of frequencies occupied by a waveform. It would be the difference in max and min frequencies.
As for the other you might lose a mark for not explaining why there was no temp change

DAMN :/ M LOSING 6 MARKS ALREADY

 

[Minsa Fatima]

no m not sure but idk they might be right
cuz the B was decreasing
it's not the value of B that matters but the change in B that does i think

The change could be say, 0-12= -12 or 0-(-12)=12 so change could be either -ve and +ve. no?

 

[anastasia grey113]

The change could be say, 0-12= -12 or 0-(-12)=12 so change could be either -ve and +ve. no?

lol idk man
u might be right
m not sure now but i drew the same graph n everybodys been telling me its wrong
dude just asking...did u find this year's paper tougher than last year's?

 

[Zaki ali asghar]

you just had to consider the gradient, like in that question. since the gradient is negative for both, emf is in same direction for both.

 

[Zaki ali asghar]

FOR BANDWITH I JUST WROTE THE RANGE OF FREQUENCIES. SHIT

 

[Zaki ali asghar]

i really hope the threshold stays between 55-60 or max of 62.

 

[anastasia grey113]

i really hope the threshold stays between 55-60 or max of 62.

dude compare it to last yea
was it harder? the '17 one?

 

[Zaki ali asghar]

i did 17 one a day before and got around 84, i think it was tougher than this year. NOOOOO last year was 55

 

[Minsa Fatima]

lol idk man
u might be right
m not sure now but i drew the same graph n everybodys been telling me its wrong
dude just asking...did u find this year's paper tougher than last year's?

I think there wasnt much differemce although I made a few silly mistakes. What about you?

 

[anastasia grey113]

I think there wasnt much differemce although I made a few silly mistakes. What about you?

i found this one tougher :/

i did 17 one a day before and got around 84, i think it was tougher than this year. NOOOOO last year was 55

dude idk i found this one tougher and like idk it should go below 55 now >.<
idk if ill get an A* if it touches 60

 

[Zaki ali asghar]

i just hope it stays in 50s!!! like even 58 but please under 60!!

 

[anastasia grey113]

i just hope it stays in 50s!!! like even 58 but please under 60!!

*sigh* yh
hey wut did ppl in ur centre say?
did they find it tough?

 

[Minsa Fatima]

i found this one tougher :/

dude idk i found this one tougher and like idk it should go below 55 now >.<
idk if ill get an A* if it touches 60

why tho. you just lost 6-7 marks

 

[Tauqir_hamed]

I found it on par with the october november 2017 papers. ( the threshold was in the mid 50s ) .. This year's will be 60 at most.. not higher than that.. But surprisingly, one the papers ( w14 43 I believe ) had a threshold = 67 for A ..
anastasia grey113 I wrote bandwidth = 2 fs, where fs is the frequency of the information signal ... is this correct ??

 

[anastasia grey113]

why tho. you just lost 6-7 marks

lol these r the marks I KNOW OF
there must be 7-8 more idk of

 

[Zaki ali asghar]

they comparatively found it easier but a lot of ppl i know messed up the graph and the specific heat q, Also some people including me probably missed some points for definitions.