Physics: Post your doubts here!

[anastasia grey113]

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 ??

yes thaz wut i wrote
max signal frequency x 2
but idk Minsa Fatima said smthng slightly different

 

[anastasia grey113]

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.

yh same
it should be low
the paper was so different...i mean its the theory part i usually mess up n it formed most of the paper
hey how many marks for the latent heat? cuz i got it wrong

 

[Zaki ali asghar]

2.

 

[Zaki ali asghar]

is it fine if i wrote gain just 9, instead of +9?

 

[anastasia grey113]

is it fine if i wrote gain just 9, instead of +9?

yh
i think it should be correct
i wrote 9 too

 

[Zaki ali asghar]

sucks how after exam you feel quite good but after like a day, you realize you prolly messed up more. happens every time

 

[anastasia grey113]

sucks how after exam you feel quite good but after like a day, you realize you prolly messed up more. happens every time

yh
n i got admissions this year
n my goals touch the sky so idk now
i messed up the graph and the latent heat
and prolly a few definitions as well

 

[Zaki ali asghar]

which uni?

 

[Minsa Fatima]

yes thaz wut i wrote
max signal frequency x 2
but idk Minsa Fatima said smthng slightly different

then I guess that would be correct

 

[Zaki ali asghar]

for greater bandwidth, more info can be carried but fewer stations so less area would be covered. are these right?

 

[anastasia grey113]

which uni?

AKU >.<

for greater bandwidth, more info can be carried but fewer stations so less area would be covered. are these right?

yh true
exact words of mine

 

[anastasia grey113]

then I guess that would be correct

well lets hope so
how many marks did this have?

 

[Zaki ali asghar]

there was a q for negative feedback too, right?

 

[Minsa Fatima]

well lets hope so
how many marks did this have?

just 1

 

[Zaki ali asghar]

a proportion of output voltage is fed back to the inverting input as to reduce the gain. is this correct for worth 2 marks? negative feedback

 

[Minsa Fatima]

a proportion of output voltage is fed back to the inverting input as to reduce the gain. is this correct for worth 2 marks? negative feedback

with 180 degree phase differene. it was mentioned in a mark scheme of a previous paper

 

[anastasia grey113]

there was a q for negative feedback too, right?

yh the Vout is fed to the inverting input to increase stability

a proportion of output voltage is fed back to the inverting input as to reduce the gain. is this correct for worth 2 marks? negative feedback

yh i think its correct
tho idk abt reducing gain since this was asked in the next part

 

[anastasia grey113]

with 180 degree phase differene. it was mentioned in a mark scheme of a previous paper

well inverting kind of means 180 phase difference aint it?

 

[Zaki ali asghar]

wasn't increased stability an advantage?

 

[Tauqir_hamed]

with 180 degree phase differene. it was mentioned in a mark scheme of a previous paper

Is this correct. I wrote this line :
" The process in which a part of the output is fed into the inverting input and the input and the output are out of phase by 180 degrees "

And for the effects , I wrote :

a) Reduced gain
b) Lesser distortion