Question

radiation is
the transfer of energy by electromagnetic waves
a distrubrance that transmits energy
the distance from one crest of a wave to the next
the number of crests of a wave in a given amount of time

Explanation:

Radiation is defined as the transfer of energy by electromagnetic waves. This is a fundamental concept in physics related to how energy is transmitted through space without the need for a medium. The other options describe different wave - related concepts: a disturbance that transmits energy is a more general description of a wave; the distance from one crest of a wave to the next is the wavelength; and the number of crests of a wave in a given amount of time is the frequency.

Answer:

The transfer of energy by electromagnetic waves.