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W6AH
Amateur Extra Class: 2020–2024
Today
Sections
E1: Commission's Rules
E2: Operating Procedures
E3: Radio Wave Propagation
E4: Amateur Practices
E5: Electrical Principles
E6: Circuit Components
E7: Practical Circuits
E8: Signals and Emissions
E9: Antennas and Transmission Lines
E0: Safety
Quick Index
Practice Test
Element 4
E6
E6F
E6F01
E6F01:
What absorbs the energy from light falling on a photovoltaic cell?
Protons
Photons
Electrons
Holes
E6F01
E6F02
E6F03
E6F04
E6F05
E6F06
E6F07
E6F08
E6F09
E6F10
E6F11