Please Help with practice test Remalhing Time: 2 hourn,20 minutes, 41 secends Qu

Question

Please Help with practice test

Remalhing Time: 2 hourn,20 minutes, 41 secends Questian Compietion Sats The semicondeosor 3C-SiC conduction band energy of Ec 2.3eV and a valence band energy of Ey0eV. What is the bandgap enengy of this smiconductor? QUESTION 2 What tem is used to descrbe a smal portion of acrystal solid that can ba used to reproduce the entie crystal structure QUESTION 3 Tha energy from ight impinging on a semiconductor predominately causes electron hastions. QUESTION 4 How meny valence electrons does sl oon and germanium possess? QUESTION What is the warvelangth of a blius laser with an energy of 2.48 eV QUESTION Match the folowing doinitons with there oorresponding tem A material that has an iregular structural composision. A matenial whose atoms folows a periodio anangonsont and orontation. b Crystaline e. Amorphous - 9A sold whosa atomio stnucture is composed of a structured arangement that varies in size and eriertation

Explanation / Answer

1 - Band gap energy is the difference between energy of conduction band Ec and energy of valence band Ev

Eg = Ec -Ev = 2.3 eV

2- Unit cell

3- can have number of answers refer to your notes

4- 4 valence electrons

5 E = hc/lambda

lambda = hc/E = 6.626 x 10-34  x 3 x108 / 2.48 X 1.6 x 10-19 = 500 nm

6 c , b , a

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