In a p-type semiconductor, a hole is
A) an extra proton supplied by a donor atom.
B) an extra electron supplied by a donor atom.
C) a donor atom.
D) a region where an electron is missing.
E) a missing atom in the crystalline structure.
Question 2
A window glass that is 0.5 cm thick has dimensions of 3 m by 1.5 m. The thermal conductivity of this glass is 0.8 W/m K.
If the outside surface of the glass is at -10C and the inside surface is at 20C, how much heat flows through the window in every hour?
A) 50 MJ
B) 60 MJ
C) 70 MJ
D) 80 MJ
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