(a) What type of semiconductor is obtained when silicon is doped with boron?
(b) What type of magnetism is shown in the following alignment of magnetic moments?
$\uparrow \uparrow \uparrow \uparrow \uparrow \uparrow$
(c) What type of point defect is produced when $\mathit{A}\mathit{g}\mathit{C}\mathit{l}$ is doped with ${\mathit{C}\mathit{d}\mathit{C}\mathit{l}}_2$ ?