Question

which type of electromagnetic radiation is used in security baggage scanners, and why?
a. gamma rays, because they are high - frequency waves, which causes them to easily bend around the objects in the baggage
b. x - rays, because they either pass through or are absorbed by the objects in the baggage, creating an image of the objects
c. radio, because its low energy makes it safe for the machine operators
d. infrared, because the waves are reflected by the objects in the baggage, creating an image of the objects

Explanation:

X - rays are used in security baggage scanners. They have the ability to penetrate different materials to varying degrees. When they pass through the objects in the baggage, some are absorbed and some pass through, creating an image based on the density and composition of the objects. Gamma - rays are too dangerous for this application. Radio waves have low energy and won't create a useful image of the contents. Infrared is mainly used for detecting heat and not for detailed imaging of baggage contents like X - rays.

Answer:

B. X - rays, because they either pass through or are absorbed by the objects in the baggage, creating an image of the objects