A.5,5mA
B.0,25mA
C.0,25A
D.0,55A

A.90 V/m
B.9.105 V/m
C.18.105 V/m
D.180 V/m

A.40 cm/s
B.30 cm/s
C.80 cm/s
D.60 cm/s

A.năng lượng âm.
B.biên độ âm
C.vận tốc truyền âm
D.tần số âm

A.\(9\)
B.\(12\)
C.\(11\)
D.\(10\)

A.\(T \in \left( {8;10} \right)\)
B.\(T \in \left( {10;13} \right)\)
C.\(T \in \left( {4;6} \right)\)
D.\(T \in \left( {6;8} \right)\)

A.\( - 45\)
B.\(26\)
C.\(\dfrac{{45}}{2}\)
D.\(30\)

A.\(\left( {800;900} \right)\)
B.\(\left( {500;600} \right)\)
C.\(\left( {700;800} \right)\)
D.\(\left( {600;700} \right)\)

A.\(\dfrac{{320}}{3}\,\,c{m^3}\)
B.\(\dfrac{{320\pi }}{3}\,\,c{m^3}\)
C.\(\dfrac{{160\pi }}{3}\,\,c{m^3}\)
D.\(\dfrac{{160}}{3}\,\,c{m^3}\)

A.\(\sqrt 5  + \sqrt {130} \)
B.\(5 + \sqrt {61} \)
C.\(\sqrt {10}  + \sqrt {130} \)
D.\(\sqrt {10}  + \sqrt {61} \)