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Post Your AS LEVEL PHYSICS PAPER 2 DOUBTS

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And when and where do we use the 'unified mass constant' and the 'elementary charge' in radioactivity calcuations?? :|
 
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Hey.Can you tell me how to solve the last part of the last question of O/N2011's 23 paper :/
6c)acceleration of alpha/acceleration of beta
a=F/m F=Eq
sooo neglect it E it eventually cancels out
so alpha acceler..... 1st:
alpha is helium nucleus so 2 proton 2 neutron
2 x 1.6 x 10 ^-19/4 x 1.67 x 10 ^-27 = 4.79 x 10^7
beta acelerat....
beta is an electron
1.6 x 10 ^-19/9.11 x 10^-31=1.76 x 10^11
so 4.79 x 10^7/1.76 x 10^11=2.7 x 10 ^-4
 
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We are only supposed to use 'unified mass constant','elementary charge' and rest masses of electrons ,protons and neutrons from the data sheet for radioactivity questions,right??
 
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just move it 0.25lambda to the right that is wat i think

That's what I thought too, but the mark scheme says: "horizontal line through central section of wave"; what does that mean?

The distance between adjacent nodes and adjacent antinodes is 0.5Lambda, right?
 
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What will happen to the internal energy, K.e and P.e of a substance during boiling,evaporation and etc. Can somebdy explain the concept to me?
 
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Can someone please upload a 'CIE endorsed' AS Physics revision guide like the one we had for bio (by Mary Jones)? tx a lot!
 
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no it is proportional to amplitude squared :)
This is the general confusion here..
Intensity is directly proportional to (Amplitude)^2
as well as
(Frequency)^2
Open May 2003 Q4b(ii) 2
Now how..do you explain the decrease in the maximum brightness..simply because the intensity has decreased as wavelength has increased.
http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s03_qp_2.pdf
http://www.xtremepapers.com/papers/...el/Physics (9702)/9702_s03_ms_1 2 3 4 5 6.pdf
 
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and for example if we have to calculate the uncertainty of the reading of a metre rule. The reading is 10. least count is 0.1 then we should take out uncertainty as: 0.1/10*100 or we should halve the least count 0.05/10*100 to take out the answer. Which 1 is it /???
 
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