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Physics: Post your doubts here!

Jaf

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http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w05_qp_4.pdf
Question 5)b)ii)
If we increase the p.d., the velocity of the particle electron will decrease. By F=Bqv, the force acting on the particle should also decrease and hence the deflection of the electron should be smaller. The mark scheme states the opposite. Can anyone help explain why?
The next part we are increasing the magnetic field strength so B increases and hence so does force therefore larger deflection. This is what the mark scheme states too. Why the discrepancy? Am I missing something?
Soldier313 ? :p
 
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Anyone? :O
7 a : each line in the spectrum of hydrogen corresponds to a specific photon,if an electron comes down to a lower energy level from a higher energy level, a photon is emitted,it can be deduced that the energy changes are discrete therefore the electron energy levels in atoms is also discrete.
i am confused with part c (n)
 
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AsA
please HELP!! explain the following : http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w10_qp_42.pdf
Q1 b (ii) & (iii)
Q2 b (ii) & (iii)
and Q5 (a) !!
where are b(ii) and (iii)

in Q2b (ii)
WorkDone = Pressure x Change in volume
for Q2(iii)
internal energy = (heat supplied) + workdone
for P-Q u find wd in part1
so just add
for Q-R workdone = 0 so U= 720
for R-P
u know sum of all IE are 0
now calc third IE
put in formula IE = q + WD
and get the wd

For 5a
apply flemings left hand rule
u'll get into the plane!!

hope this helps
 
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