A.Hình C
B.Hình D
C.Hình B
D.Hình A

A.\(x = \pm \frac{{A\sqrt 2 }}{2}\)
B.\(x = \pm \frac{A}{2}\)
C.\(x = \pm \frac{{A\sqrt 2 }}{4}\)
D.\(x = \pm \frac{A}{4}\)

A.\(Q = {3.10^{ - 8}}\left( C \right)\)
B.\(Q = {3.10^{ - 5}}\left( C \right)\)
C.\(Q = {3.10^{ - 7}}\left( C \right)\)
D.\(Q = {3.10^{ - 6}}\left( C \right)\)

A.2,0m.
B.1,0m.
C.1,5m.
D.0,5m.

A.\(u = 80\sqrt 2 .cos\left( {100\pi t - \frac{\pi }{3}} \right)V\)
B.\(u = 80.cos\left( {100\pi t - \frac{\pi }{3}} \right)V\)
C.\(u = 80\sqrt 2 .cos\left( {100\pi t + \frac{\pi }{3}} \right)V\)
D.\(u = 80.cos\left( {100\pi t + \frac{{2\pi }}{3}} \right)V\)

A.96W
B.120W
C.240W
D.48W

A.\(\frac{\pi }{2}\)
B.\(\frac{\pi }{3}\)
C.\(\frac{\pi }{4}\) hoặc \( - \frac{\pi }{4}\)
D.\(\frac{\pi }{6}\) hoặc \( - \frac{\pi }{6}\)

A.1,8s.
B.0,32s.
C.0,8s.
D.0,57s.

A.8
B.7
C.16
D.9

A.9cm
B.8cm.
C.6cm.
D.5cm