Question

a) Account for two kinds of semiconductor and use schemes to explain charge flow between n-type and p-type semiconductors in the dark condition without a bias

b) A substance known to have a cubic unit cell gives reflections with Cu Ka radiation (wavelength 154 pm) at the glancing angle of 32.6°.

The reflection is known to be due to the (220) plane. Index the reflection at the glancing angle of 39.4°

Answer 1

Sinee 15 ץ= 2d Sin 32.1 2. ママ Sm 16.3028 275 PM a"Yle for eubie ryntal 39.4 マス Sin 19.7 229.42 a 275 at osgle 228. 42 777.81 7t in only pom ible when んk,l '^(222) .