Qualification > Sciences

Physics Paper4

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ruby92:
M/j 2005 question 7 c.

basoom16:
lol how does the value become 1/10

Sue T:
manganese decays to form iron ryt? so if
iron/manganese = 9
it means out of 10 molecules, 9 are iron and 1 is manganese
so its like 1/10 of manganese has decayed
so u use the eqn with 1/10 and the decay constant of manganese

ruby92:
M/j 2004 7c,b , why is h squared?
M/j 2005 5(b)
o/n 2005 for question 3b (i) why is work done negative, isnt work dont on the system?
M/j 2006 4(c), Q7 (a) and (b)
O/n2006 7b
M/j 2007 Q3 d
o/n 2008 3c(ii)
M/j 2009 9b, 11 biii

Any help would be awesome!

Sue T:

--- Quote from: ruby92 on May 09, 2011, 07:55:55 pm ---M/j 2004 7c,b , why is h squared?


--- End quote ---

so 2007 >> E=(1/2)mv2   and lambda=h/p where p=mv
so             mv2=2E
                v=sqroot(2E/m)
                                                                                p=m x sqroot(2E/m)  (muliply numerator and denominator by sqroot m)                                             p=m x sqroot( 2E m) / (sqrootm)2
                                                                                p= sqroot(2Em)
substitute p back into lambda=h/p
you get wat they're askin

part c) get E by substituting everything else in then use E=Ve where V is th pd and e is the charge on th electron
h is squared cuz amm if u want to make E the subject of the formula you have 2 square everything else if u still dont get it tell me ill attach a working
                                                                               

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