Chemical analysis of a silicon crystal reveals gallium at a level of 3.091X10^-2 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

1.598e14.

Answer 2

an explanation please?
i need a formula!

Answer 3

The answer is not right, at least for me. anyone who knows how to do it and could write how ?

Answer 4

Please, I need the formula!

Answer 5

The answer 1.598e14 was not right for me too. Any ideas what happen and how to write it out?

Answer 6

What is the formula to use

Answer 7

Please, I need the formula!

Answer 8

The data for everyone of us is different as you noticed formula is required

Answer 9

Go to back to H4P2

Answer 10

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

Answer 11

1.5455*10^19

Answer 12

gallium level*10^-2) what is this?

Answer 13

What is the formula, please?

Answer 14

What about 3.091*10^-7? please

Answer 15

H4P2

Answer 16

1.6265*10^14 i have the answer for 3.091*10^-7
here the caculation
atomic percent*NA(avogadro number)

the solution/atomic volume of gallium

Answer 17

1.5442*10^14
this is the corect ones

Answer 18

step1
(6.023*10^23)/(12.05)=m

step 2
m*(level of atomic percent)*(10^-2)