Homework Help: Chemistry

Posted by Ling on Friday, January 11, 2013 at 10:36pm.

(a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material.

(b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters.

Chemistry - qpt, Friday, January 11, 2013 at 10:37pm
a) 6.22*10^18

No idea for b) any thoughts or how to for b)?
Chemistry - schoolgirl, Saturday, January 12, 2013 at 3:39am
b please...
Chemistry - Rufus, Saturday, January 12, 2013 at 9:04am
b) 10^7 / lamda*(wavelength in nm)
Chemistry - ani, Saturday, January 12, 2013 at 10:31am
something wrong i cant got it
Chemistry - martin, Saturday, January 12, 2013 at 10:31am
rufus, please what is answer
Chemistry - Anonymous, Saturday, January 12, 2013 at 1:37pm
1.09E13
Chemistry - Anonymous, Saturday, January 12, 2013 at 1:43pm
WRONG
Chemistry - qwerty, Saturday, January 12, 2013 at 2:34pm
wavenumber= Eg / hc

Eg(Silicon band energy)= 1.11 eV (to joules)
h=6.6*10^-34
c=3*10^8

wavenumber= Eg*1.6*10^-19 / hc = 896969.69
Chemistry - Anonymous, Saturday, January 12, 2013 at 3:18pm
thanks
Chemistry - Ling, Saturday, January 12, 2013 at 5:06pm
Thank you for the explanation.

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