Question

which of the following has the shortest wavelength?
a ultraviolet
b thermal infrared
c near infrared
d microwaves
e visible

Explanation:

In the electromagnetic spectrum, wavelength and frequency are inversely related. Ultraviolet (UV) has a shorter wavelength than visible light, infrared (near and thermal), and microwaves. The order of increasing wavelength (decreasing frequency/energy) is: UV < Visible < Near Infrared < Thermal Infrared < Microwaves. So UV has the shortest wavelength among the options.

Answer:

A. Ultraviolet