Traveling on airplanes means checking in at airports and having your luggage
.................. The machines that perform this duty are typically ....................... or
X-ray scanners. The principle of a metal detector involves wire coils, a transmitter and
current that creates a(n) .................. field. Any metallic object that enters this
electromagnetic field will ................... the current and signal a(n) ........................ .
X-ray or CT scanning technology is used to ....................... the density and mass of
objects, even their chemical components. In busy airports, large trucks with built-in Xray
scanners are used to scan large amounts of ............... at one time.