chemistry

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?

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

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

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    posted by someguy
  3. Thank you someguy

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    posted by Odesa
  4. how can you do this one?

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    posted by aaa
  5. What is the formula?, please

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    posted by qwerty
  6. but answer is not right its not 5.00*10^22

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    posted by student
  7. guys check ur index value of the gallium levels they are different

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  8. CHEAT!

    These are midterm exam problems. They shouldn't be posted here. Anyone who does Deserves yo be kicked off the course.

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    posted by MIT2
  9. (6.023*10^23)/(12.05)=m
    m*(3.091*10^-8)*(10^-2)=

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    posted by Odesa

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