Hey guys,

As Im a noob at maths I need your help in making r the subject so I can figure out the radius of my nanoparticles. Can someone please help :)

http://a.imagehost.org/t/0280/Effective_mass.jpg

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- Sep 27th 2009, 08:10 PMDonutMaking r the subject
Hey guys,

As Im a noob at maths I need your help in making r the subject so I can figure out the radius of my nanoparticles. Can someone please help :)

http://a.imagehost.org/t/0280/Effective_mass.jpg - Sep 27th 2009, 08:34 PMpickslides
Hi Donut

Mulitply both sides through by $\displaystyle r^2$

you can then use the quadratic formula to solve for r. - Sep 27th 2009, 09:14 PMDonut
hmm thats what I thought I should do but I get keep getting this obscenely small number. Back to the drawing board I guess >_<

Thanks for the reply

I might post up all my previous working in a sec and see if someone can see the holes in it. - Sep 27th 2009, 09:31 PMDonut
http://img15.imageshack.us/img15/6139/radiuscalc.th.jpg

Are the calculations right? - Sep 27th 2009, 11:06 PMDonut
If I can find out that all the above maths is correct it would be a massive help (Nod)

- Sep 28th 2009, 02:29 PMpickslides
Take your solutions for r and sub them into the RHS of the equation. Does it give you the LHS?