Linear accelerator is defined as

Linear accelerator is defined as

• A. A laser device used to carve patterns on the surface
• B. A tool used to heat treat diamonds
• C. A device to generate X-rays from a target
• D. A machine used to accelerate electrons to high energy along a straight path.

Answer: (D)

A linear accelerator is a device that uses rapidly switching electric fields in a sequence of accelerating cavities to push electrons to higher energy as they travel in a straight line. The essential idea is the straight path: the beam moves forward through each cavity, gaining energy with every stage. This distinguishes it from circular accelerators, where magnets bend the beam into a loop so it can pass through the same accelerating structures again and again. Producing X-rays can be a downstream use of the high-energy electron beam when it hits a target, but that outcome is not the defining feature of a linear accelerator. The laser-based device and the diamond heat-treatment tool describe different technologies and aren’t relevant to what a linac does.

A linear accelerator is a device that uses rapidly switching electric fields in a sequence of accelerating cavities to push electrons to higher energy as they travel in a straight line. The essential idea is the straight path: the beam moves forward through each cavity, gaining energy with every stage. This distinguishes it from circular accelerators, where magnets bend the beam into a loop so it can pass through the same accelerating structures again and again. Producing X-rays can be a downstream use of the high-energy electron beam when it hits a target, but that outcome is not the defining feature of a linear accelerator. The laser-based device and the diamond heat-treatment tool describe different technologies and aren’t relevant to what a linac does.