Physics: Post your doubts here!

[anastasia grey113]

because the decay constant is big so unstable

dint v have to compare?
like for the second one the constant was larger than the first one?

 

[Zaki ali asghar]

also since decay constant is big, half life is lesser acc to the eq relating the two

 

[anastasia grey113]

also since decay constant is big, half life is lesser acc to the eq relating the two

yh but i wrote abt half life and decay constant but dint write the equation

 

[anastasia grey113]

for the CT Scan it was
X-Ray images taken from different angles of a single slice
repeated for a series of slices
images processed and displayed
3D images formed
can be rotated
is it?

 

[Tauqir_hamed]

oh one last qs
wut did u guys write for the last part?
why is the intermediate nucleus so less?

since lambda is large, t half is small.. so the time taken for the number of undecayed nuclei to fall to half its original value is very small.. hence , the nuclei wont stay in the sample for a long time

 

[anastasia grey113]

since lambda is large, t half is small.. so the time taken for the number of undecayed nuclei to fall to half its original value is very small.. hence , the nuclei wont stay in the sample for a long time

ohhhh

 

[Tauqir_hamed]

lol who says itll be high?

well i am praying as well that it isnt that high.. but i have just HEARD people saying that it was very easy..
what did you write about defining radioactivity

 

[Zaki ali asghar]

image of one slice/section
images (of one slice) taken from different angles to give 2D image (of one slice)
(repeated for) many slices
to build up 3D image (of whole body/structure)
thats four points, no idea about the 5th one.

 

[haithsoul]

for the CT Scan it was
X-Ray images taken from different angles of a single slice
repeated for a series of slices
images processed and displayed
3D images formed
can be rotated
is it?

you should have mentioned building 2d image as well first

 

[haithsoul]

image of one slice/section
images (of one slice) taken from different angles to give 2D image (of one slice)
(repeated for) many slices
to build up 3D image (of whole body/structure)
thats four points, no idea about the 5th one.

mention x ray

 

[haithsoul]

well i am praying as well that it isnt that high.. but i have just HEARD people saying that it was very easy..
what did you write about defining radioactivity

people who say its easy often make silly mistakes

 

[Zaki ali asghar]

series of X-ray images (for one section/slice) M1 taken from different angles M1 to give image of the section/slice A1 repeated for many slices M1
to build up three-dimensional image (of whole object) A1
these are the five points acc to a ms of S14

 

[anastasia grey113]

series of X-ray images (for one section/slice) M1 taken from different angles M1 to give image of the section/slice A1 repeated for many slices M1
to build up three-dimensional image (of whole object) A1
these are the five points acc to a ms of S14

well in some mark schemes there was one for the fact that the image can be rotated

 

[anastasia grey113]

well i am praying as well that it isnt that high.. but i have just HEARD people saying that it was very easy..
what did you write about defining radioactivity

well it was when large unstable nuclei emit radiations like alpha beta and gamaa to produce stable daughter nuclei
thaz wut i wrote

 

[ThePacifics]

if anyone here gave physics paper 41 then I wanted to confirm whats the proper answer to that iron core and aluminium foil jumping upwards answer?

 

[Kanekii]

Anyone has any good resources for "Momentum" and "Errors and Uncertainties" physics As

 

[Tauqir_hamed]

GUYS , IN THE SHM QUESTION ABOUT THE TROLLEY, WE WERE ASKED TO STATE AND EXPLAIN THE TYPE OF DAMPING IN THE TROLLEY.. HOWEVER, I DONT THINK I READ THE QUESTION PROPERLY .. I HEARD THAT IT SAID " STATE AND EXPLAIN " .. WHILE I ONLY STATED THE ANSWER AS '' LIGHTLY DAMPED ''.. WILL I GET A MARK..
I AM WORRIED BECAUSE WHAT IF THE MS IS SOMETHING LIKE THIS :
energy dissipates gradually with time M1
so lightly damped A1
I WON'T GET A SCORE IF IT IS LIKE THIS BECAUSE I WONT HAVE EARNED M1 ...

 

[hammadfbh]

Does anyone know about confidential of Paper 33?

 

[Parhaakoo]

Does anyone know what happens if ur unable to complete the paper for some reason? My friend got unwell in p4 and she had attempted first 3-4 questions only. She wrote a report instead. Her expected grade is A*. Is there a chance she can still score A* if she does really well in other 4 papers?

 

[anastasia grey113]

GUYS , IN THE SHM QUESTION ABOUT THE TROLLEY, WE WERE ASKED TO STATE AND EXPLAIN THE TYPE OF DAMPING IN THE TROLLEY.. HOWEVER, I DONT THINK I READ THE QUESTION PROPERLY .. I HEARD THAT IT SAID " STATE AND EXPLAIN " .. WHILE I ONLY STATED THE ANSWER AS '' LIGHTLY DAMPED ''.. WILL I GET A MARK..
I AM WORRIED BECAUSE WHAT IF THE MS IS SOMETHING LIKE THIS :
energy dissipates gradually with time M1
so lightly damped A1
I WON'T GET A SCORE IF IT IS LIKE THIS BECAUSE I WONT HAVE EARNED M1 ...

well there were two marks so idk
i dont think so