Answer:
E. All of these travel at the same speed
Explanation:
The speed of electromagnetic radiation does not depend on its frequency, but only on the properties of the medium.
For instance, in a vacuum all electromagnetic waves travel at the same speed, called 'speed of light', whose value is
[tex]c=3\cdot 10^8 m/s[/tex]
and which is a fundamental constant.
When travelling in a medium, all electromagnetic waves slow down, according to the formula
[tex]v=\frac{c}{n}[/tex]
where v is their speed in the medium, and n is called refractive index of the medium, whose value depends on the properties of the medium itself. As we see, there is no dependency on the frequency of the wave, so all electromagnetic waves travel at same speed.
