Homework Help: chemistry

Posted by schoolgirl on Saturday, January 12, 2013 at 3:38am.

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

chemistry - drwls, Saturday, January 12, 2013 at 7:18am
What material?
chemistry - martin, Saturday, January 12, 2013 at 9:48am
50 g Si doped with 27g Sb
chemistry - schoolgirl, Saturday, January 12, 2013 at 11:41am
Here is the full question:
(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.
Answer for a=6.22*10^18
(b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters.
chemistry - Ling, Saturday, January 12, 2013 at 5:06pm
a) 6.22*10^18

b)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 - BRA, Sunday, January 13, 2013 at 6:45am
8.97*10^5

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