Which of the following is the best definition of radiation?
A.
the transmission of heat without any contact
B.
the transmission of heat across matter
C.
the transfer of heat by electrical currents
D.
the transfer of heat by currents within a liquid or gas
I would say C, because radiation is the transfer of heat through electromagnetic waves. However, the sun also doesn’t make contact with the Earth so the answer may be B as well (If is were you I would say C).
