Which of the following types of electromagnetic radiation has the longest wavelength?

Radio waves

Ultraviolet waves

Visible light

X-rays

Answer: Radio waves. Next longer is visible, ultraviolet, and shortest is x-rays.

Step-by-step explanation:

Just a fact. Radio waves also have the lowest energy and frequency. This is a physics question.

Wavelength = speed of light/frequency

Meters = meters per second / Hertz

= meters / second * seconds

Energy = Planck's constant times frequency.