A.Đỏ.
B.Vàng.
C.Cam.
D.Chàm.

A.electron
B.ion dương.
C.ion âm.
D.lỗ trống.

A.\({n_t} > {n_d} > {n_v}.\)
B.\({n_d} < {n_v} < {n_t}.\)
C.\({n_v} > {n_d} > {n_t}.\)
D.\({n_d} > {n_t} > {n_v}.\)

A.\(2\pi \sqrt {\frac{k}{m}} .\)
B.\(\sqrt {\frac{m}{k}} .\)
C.\(2\pi \sqrt {\frac{m}{k}} .\)
D.\(\sqrt {\frac{k}{m}} .\)

A.50 W.
B.400 W.
C.100 W.
D.200 W.

A.1,01s.
B.0,992s.
C.1,007s.
D.1,04s.

A.\(i = \frac{u}{Z}.\)
B.\(\tan \varphi  = \frac{{{Z_L} - {Z_C}}}{R}.\)
C.\({Z_C} = \frac{1}{{\omega C}}.\)
D.\(i = \frac{{{u_R}}}{R}.\)

A.\(0,5\sqrt 3 {B_0}.\)
B.\(0,5\sqrt 2 {B_0}.\)
C.0,5E0.
D.E0.

A.0,85 eV.
B.–1,51 eV.
C.– 0,85 eV.
D.1,51 eV.

A.1 mm.
B.2,5 mm.
C.5 mm.
D.2 mm.