An electric current is the flow of ___________.
A: sort
B: stream
C: energy electrons
D: electrons
A: sort
B: stream
C: energy electrons
D: electrons
举一反三
- Electric circuit is a combination of a conductor and of a source of e.m.f. which permits electrons to flow along a ______. A: stream B: wire C: terminal D: light
- When there are two electrons in the N-layer of a ground state atom, The M-layer must have A: 8 electrons B: 10 electrons C: 18 electrons D: 8-18 electrons
- 中国大学MOOC: Small __________ electrons are, they play an important role in the formation of electric current.
- A metal surface illuminated by 8.5×1014 Hz light emits electrons whose maximum energy is 0.52 eV. The same surface illuminated by 12.0×1014 Hz light emits electrons whose maximum energy is 1.97 eV. The work function of the metal is ( B )
- For the same nuclide, which character must be identical? () A: Proton number B: Neutron number C: Electrons number D: Energy state