Question

1. which type of electromagnetic radiation is used for airport security? gamma x - ray ultraviolet infrared

Explanation:

X - rays are a type of electromagnetic radiation. They have the ability to penetrate through many materials. In airport security, X - ray machines are used. These machines send X - rays through luggage. The X - rays interact differently with different materials (e.g., denser materials like metals absorb more X - rays). The resulting image on the detector shows the contents of the luggage, allowing security personnel to check for prohibited items. Gamma rays are too dangerous and have more medical and industrial uses (e.g., sterilization in some cases). Ultraviolet radiation is used in areas like detecting counterfeit money (due to fluorescence of certain materials under UV) but not for seeing inside luggage. Infrared radiation is used in thermal imaging (e.g., detecting heat sources) but not for the detailed inspection of luggage contents like X - rays.

Answer:

B. X - ray