Calculation of electron orbits (1 Viewer)

[cutemouse]

Hi,

Is this stuff still in the syllabus?

The equation is r=(nh)/(2πmv)

Also, how about the stuff about cathode ray forces and equating them with the centripetal acceleration (F=(mv²)/r) formula?

Thanks

 

[dp624]

yeah, maybe its not explicitly stated but you should know it anyways

 

[cutemouse]

Well you see I'm kinda using a book from the 2000 syllabus so I feel that I need to know the concept, but not calculations. But I'm waiting on someone like Trebla to advise me on their 'expertise'

 

[dp624]

Well to be completely honest i consider myself as having quite a lot of expertise =P

You should know both the concept and simple calculations (ie subbing in)
but probably not the electron orbital radius unless it's part of a processes question (ie phys skills)

 

[Trebla]

Any equation not on the formula sheet is not an equation you are expected to know. You should check with the actual syllabus documents to see whether you will be asked to do calculations on certain equations.
As for equating force on a cathode ray with centripetal force, you should be able to derive the expression from the given formulae.

 

[cutemouse]

Yes, I can derive it from the given formulae. But then again I can also derive the equation for the EMF of a motor, but it's not required.. so I was just checking.

And no, the syllabus doesn't have any reference to those equations.