| Thus, the strengths of the electromagnetic, weak, and strong forces depend upon the energy at which they are measured. |
| Light bullets are the quanta of the electromagnetic field and are known as photons. |
| Unfortunately, Earth's atmosphere blocks almost all wavelengths in the electromagnetic spectrum. |
| Molecules may change their rotational energy levels by absorbing energy from electromagnetic radiation in the microwave region of the spectrum. |
| Why is that electrons radiate electromagnetic energy when they are accelerated? |
| Counting photons, particles that carry electromagnetic energy including X-rays, was critical to this discovery. |
