Question

Pick the type of radiation with the least wavelength range among the following.

• A. Infrared
• B. Ultraviolet
• C. Microwave
• D. Radio

Answer 1

The correct option is B Ultraviolet

Wavelength range for the given radiation of the electromagnetic spectrum is:

• UV rays - $300\text{pm}-400\text{nm}$
• Infrared rays - $800\text{nm}-0.3\text{mm}$
• Microwaves - $0.3\text{mm}-20\text{cm}$
• Radiowaves - greater than $20\text{cm}$

Therefore, among the given, ultraviolet (UV) has the least range of wavelength.