1. What was the electromagnetic spectrum ?
A. The complete collection of all colors of light, arranged from red to violet.
B. A device such as a diffraction grating or prism that separates light into colors
C. The complete collection of electromagnetic waves, from radio waves to gamma rays
D. The rainbow of colors seen in an oil coating on an electromagnet

The electromagnetic spectrum was the complete collection of electromagnetic waves, starting from radio waves to gamma rays at the end. The correct option is C.

What is spectrum?

The range of wavelengths or frequencies over which electromagnetic radiation extends is called spectrum.

The electromagnetic spectrum with respect to highest to lowest energy are in order: gamma rays, X-rays, ultraviolet radiation, visible light, infrared radiation, and radio waves.

Thus, the electromagnetic spectrum was the complete collection of electromagnetic waves, starting from radio waves to gamma rays at the end. The correct option is C.

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