Commit 9a27d9b7 authored by Isidora Araya's avatar Isidora Araya
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Update 13_semiconductors_solutions.md

parent b4623290
......@@ -9,11 +9,11 @@ from math import pi
### Subquestion 1
Electrons near the top of the valence band have a negative effective mass, their energy decreases as $k$ increases from 0, and they have a positive group velocity for $k>0$.
Electrons near the top of the valence band have a negative effective mass, their energy decreases as $k$ increases from 0, and they have a negative group velocity for $k>0$.
### Subquestion 2
Holes near the top of the valence band have a positive effective mass, their energy increases as $k$ increases from 0, and they have a positive group velocity for $k>0$.
Holes near the top of the valence band have a positive effective mass, their energy increases as $k$ increases from 0, and they have a negative group velocity for $k>0$.
### Subquestion 3
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