A His name is Ken Jordan. His first name is Ken. His family name is Jordam His phone number is 303-6574. This is his basketball. What's that? It's a notebook.It isn't his notebook. It-s Eli-s notebook. ' ( )21. His last name is________
【简答题】试由霍尔系数的定义和载流子所受洛伦兹力,粗略地证明p型半导体的霍尔系数,n型半导体的霍尔系数,式中np和nn试由霍尔系数的定义和载流子所受洛伦兹力,粗略地证明p型半导体的霍尔系数R=1/n n >0 ,n型半导体的霍尔系数R=-1/n q <0,式中n p 和n n 分别表示空穴或电子的浓度。