Chemical analysis of a silicon crystal reveals gallium at a level of 3.091×10−8 atomic percent. Assuming that the concentration of thermally excited charge carriers from the Si matrix is negligible, what is the density of free charge carriers (free carriers/cm3) in this Si crystal?

Answer 1

As its Si: 5.00*10^22 / (gallium level*10^-2)

Answer 2

this one is wrong

Answer 3

5.00*10^22 / (gallium level*10^-8)

Answer 4

i cant get right answer pls help

Answer 5

1.54e13

Answer 6

CHEAT!

Do NOT help this person. They are trying to cheat in a midterm exam.

Answer 7

(6.023*10^23)/(12.05)=m
m*(3.091*10^-8)*(10^-2)=

Answer 8

funny enough all those who say cheat only post afterthe answer are revealed. thank to MIT2