Question

_______ region in the electromagnetic spectrum is below 190 nm.

• A. \( \text{Near UV region} \)
• B. \( \text{Microwave region} \)
• C. \( \text{Vacuum UV region} \)
• D. \( \text{Low UV region} \)

Hint:

Think of "vacuum" as needing special equipment because these short UV wavelengths are absorbed by air.

Answer 1

The Correct Option is C

The ultraviolet (UV) region of the electromagnetic spectrum is typically divided into three sub-regions: - Near UV: approximately 200-400 nm - Far UV (or Mid UV): approximately 122-200 nm - Vacuum UV: approximately 10-122 nm (though sometimes the range is considered up to 200 nm with Far UV being a sub-region within it) Given the options and the common subdivisions, the region below 190 nm falls within the vacuum UV region. The near UV region is above 200 nm. The microwave region is at much longer wavelengths (millimeters to centimeters). The term "low UV region" is not a standard classification.