:
N 18
1. = 300 . 1,58 m e 0,362 m e. = 300 0,66 .
2. ,
(Na = 1017 3), , 0,59 me, mp = 100 2×1×1, 1, E v + 0.045 .
3. , -
t p -.
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N 19
1. = 300
EF = E c 0,53 , E c . , 1,1 .
2. SiO2 , l = 13 /(×),
m = 44 /(×), v = 5 /. r = 2,65×103 /3, m = 60×103 /.
3. .
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N 20
1. 0.48 ×. , 0.36 0.16 2/(×).
2. , , 1016 3 ( E d = E c 0,01 ). ? 1,58 m e 0,362 m e. 0,785 .
3. , g (w). , Z 3 N (N ).
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N 21
1. E = E v + 0,045 = 100 ? D W = 1,1 . 0,91 m e 0,595 m e .
2. , ( -), 6.7×107 2/.
3.
, (T << TD) (T >> TD) . TD .
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