which equation is related to it?
Maxwell's equations
Electromagnetic radiation
According to Maxwell's equations
how does the redshift show galaxies are moving away from us If a source of the light is moving away from an observer, then redshift occurs; if the source moves towards the observer, then blueshift occurs. what is meant by this red term? In physics, redshift is a phenomenon where electromagnetic radiation (such as light) from an object undergoes an increase in wavelength. the kind of radiation you mentioned here; what is it actually? In physics, electromagnetic radiation refers to the waves of the electromagnetic field, propagating through space, carrying electromagnetic radiant energy.
wiki:1606191
Electromagnetic radiation [SEP] Maxwell’s equations
James Clerk Maxwell derived a wave form of the electric and magnetic equations, thus uncovering the wave-like nature of electric and magnetic fields and their symmetry. Because the speed of EM waves predicted by the wave equation coincided with the measured speed of light, Maxwell concluded that light itself is an EM wave. Maxwell's equations were confirmed by Heinrich Hertz through experiments with radio waves. According to Maxwell's equations, a spatially varying electric field is always associated with a magnetic field that changes over time. Likewise, a spatially varying magnetic field is associated with specific changes over time in the electric field.