Ultraviolet light is best described as which of the following?

Ultraviolet light is best described as which of the following?

• A. Part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of X-rays
• B. Light with frequencies higher than X-rays
• C. Light that is visible to the eye
• D. Light that travels as sound

Answer: (A)

Ultraviolet light sits in the electromagnetic spectrum with frequencies higher than visible light but lower than X-rays. That placement explains why we can’t see it with our eyes—our vision only detects visible wavelengths, while UV lies just beyond that range. Because UV has a higher frequency than visible light, its photons carry more energy, which is why UV can cause effects like skin damage and is used for sterilization. The other statements don’t fit because UV is not described as having frequencies higher than X-rays (that would place it beyond X-rays, not between visible light and X-rays), it is not visible to the eye, and light does not travel as sound (sound is a mechanical wave, while UV is electromagnetic).

Ultraviolet light sits in the electromagnetic spectrum with frequencies higher than visible light but lower than X-rays. That placement explains why we can’t see it with our eyes—our vision only detects visible wavelengths, while UV lies just beyond that range. Because UV has a higher frequency than visible light, its photons carry more energy, which is why UV can cause effects like skin damage and is used for sterilization.

The other statements don’t fit because UV is not described as having frequencies higher than X-rays (that would place it beyond X-rays, not between visible light and X-rays), it is not visible to the eye, and light does not travel as sound (sound is a mechanical wave, while UV is electromagnetic).