Physics: Post your doubts here!

[salvatore]

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_s08_qp_4.pdf
qn no. 6(b).. for part i, why is the distance 2.8cm? Shouldn't it be 4.5cm?
I'll be really grateful for a prompt response

 

[LeQuavina]

what's the number they write after the elements e.g Two Helium4 ? and we find the mass of the 2 atoms by multiplying u into 4 or 2?

 

[kitkat <3 :P]

what's the number they write after the elements e.g Two Helium4 ? and we find the mass of the 2 atoms by multiplying u into 4 or 2?

we multiply it by 4

 

[scouserlfc]

Why in satellite transmission the uplinks power is greater than downlinks power ???

 

[abruzzi]

in such questions first what u need to do is try to identify the mass of iron and Mn left.....so if u getting 9 as ratio so they must be 0.9 for iron and 0.1 for Mn....
hence ratio 0.9/0.1=9
now sine we have half life of reaction ,we can find decay constant of it=ln2/half life in sec=.693/2.6x 3600=7.4 x 10^-5/s
hence using exponential decay eq
0.1=1 x e^(-7.4 x 10^-5 ) x time
proceed further to find time which will be in sec so convert to hours
further procedure...
ln 0.1=-7.4 x 10^-5 x time

Thanks a lot!

 

[Rutzaba]

which university offers minors in Pakistan. i also wanted to do a minor :/
naa its a good choice not saying its a bad one just asking .
p.s minor in STATS . i hate it for some damn reason make stupid errors :/

Other options were economics n chemistry

 

[LeQuavina]

we multiply it by 4

why?

 

[Usama Shahab]

PhYsIcS BeSt ReVeSiOn NoTeS

 

[sma786]

Oooooooh I AM FREAKING OUT.

 

[kitkat <3 :P]

Mass of helium is 4u so we multiply it by 4

why?

 

[Champ101]

How was the paper guys? variant 42?

 

[kitkat <3 :P]

How was the paper guys? variant 42?

was it easy?

 

[Hassan Ali Abid]

How was the paper guys? variant 42?

some questions were difficult and tricky involving alot of calculations.
Some questions were totally of new pattern ..Didnt see type of questions before in the past pprs.

 

[Champ101]

was it easy?

Not really! :\ the paper was tricky!

 

[Champ101]

some questions were difficult and tricky involving alot of calculations.
Some questions were totally of new pattern ..Didnt see type of questions before in the past pprs.

exactly. I hope i maintain my grade :| i didn't expect this...

 

[Hassan Ali Abid]

exactly. I hope i maintain my grade :| i didn't expect this...

How much marks are you expecting in the ppr ?

 

[Champ101]

How much marks are you expecting in the ppr ?

Can't say bro...all i can say is i might loose around 20 marks

 

[Champ101]

And the questions i attempted, well i am not sure about everything

 

[Hassan Ali Abid]

And the questions i attempted, well i am sure about everything

Same here ...

 

[A star]

Can't say bro...all i can say is i might loose around 20 marks

atleast 20 for me :/