Final answer:
The statement that an electromagnetic wave consists of changing electric and magnetic fields is true. These fields are perpendicular to each other and propagate together in a transverse wave as shown in Figures 15.2 and 24.7.
Step-by-step explanation:
An electromagnetic wave indeed consists of changing electric and magnetic fields. This statement is true. The fields in question are electric fields (E) and magnetic fields (B), which are inherently tied to one another. When an electric current oscillates, it generates these perpendicular fields which then propagate together as an electromagnetic wave. For instance, in Figures 15.2 and 24.7, it's shown that the electric and magnetic fields are in phase, perpendicular to each other, and also perpendicular to the direction of the wave’s propagation. During propagation, these fields oscillate and are said to be a function of both space and time. Without free charges or currents in free space, as per Maxwell's equations, it's illustrated that the electromagnetic wave spreads out as a transverse wave with its oscillating fields adhering to this perpendicular orientation.