Help for Quantum Phys A2

[ruletheworld]

heyy....i know its late but can any1 explain the point in 25 (b) and (d) 

m kinda freaked out abt the 2 p4s tomoro 

done revisin physics almost but chem is left

help pleaseee!

Thanks

best wishes to all

[ruletheworld]

and oops
its charged particles, not quantum

my bad

i hope they don't give qs from this :S

[LupeFiasco]

aight jus hold on a min.

[LupeFiasco]

you got to use the milikan's experiment if u know what it is.

[ruletheworld]

jus the milikan's? 

[LupeFiasco]

jus the milikan's? 

Yes jus the milikan's exp. and its 3 importance:

1. It show electricity has an atomic nature: the charge of an electron is like the atom of an electricity.

2. Gives out the value of avogadro's constant.

3. Mass of electron (electronic mass) is determined.

[LupeFiasco]

this is for (b) part. For (d), explain the movement of charge through an electric or magnetic field, similar to an ossciloscope..........then by using centripetal force or cent. acc. formula, you get the velocity and acceleration.

[LupeFiasco]

want further explanation ? ............what's ur name By the way, or ur nickname i might know u.........they call me don because' it's d last syllable on my name.

[eye-candy]

urmm.....hw does milikans exp. giv avagadros constant??

[LupeFiasco]

urmm.....hw does milikans exp. giv avagadros constant??

if u know stoke's formula........

1. To displace 1 mole of matter, 96,487 coulumbs (=1 Farad) is required (standard).
2. Then electronic charge or basic charge is (1.6x10^-19).

3. thereby, [96,487 / (1.6x10^-19)] = 6.03x10^23.

P.S electronic charge is found from stoke's formula (not required, u jus gotta know that electronic charge found from exp. is such value) and the displacement of 1 mole requiring 1farad is general stuff. You use the formula:

{ F=L/e }

[LupeFiasco]

*stoke's formula not part of syllabus.