A. Characterize each of the following as absorption or emission: an electron moves
from E2 to E1; an electron moves from E1 to E3;
and an electron moves from E6 to E3

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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i believe the answer is three water molecules