Which term describes electromagnetic energy invisible to the human eye?

Which term describes electromagnetic energy invisible to the human eye?

• A. Ultraviolet
• B. Visible spectrum
• C. Prism
• D. Filter

Answer: (A)

Electromagnetic energy comes in many wavelengths, and our eyes only detect a small part called the visible spectrum. Ultraviolet energy lies beyond the violet end of that visible range, so it is not visible to humans. It’s a type of electromagnetic radiation, just like visible light, but with wavelengths shorter than what we can see. A prism is a tool that separates light into colors, and a filter changes which wavelengths pass through—neither describes a kind of energy itself. The visible spectrum is simply what we can see, not the invisible energy.

Electromagnetic energy comes in many wavelengths, and our eyes only detect a small part called the visible spectrum. Ultraviolet energy lies beyond the violet end of that visible range, so it is not visible to humans. It’s a type of electromagnetic radiation, just like visible light, but with wavelengths shorter than what we can see. A prism is a tool that separates light into colors, and a filter changes which wavelengths pass through—neither describes a kind of energy itself. The visible spectrum is simply what we can see, not the invisible energy.