WAEC - Physics (2007 - No. 45)
The correct sequence of energy transformation in the operation of an x-ray tube is i. X-rays ii. Kinetic energy of thermo electrons iii. Potential energy of the target atoms iv. Heat energy of the emitted electrons
iv, iii, ii, i
ii, iv, iii, i
iv, ii, iii, i
iii, iv, ii, i
설명
X–rays are a stream of particles that are emitted when fast accelerating or moving electrons collide with a tungsten target. X-rays are produced when electrons produced by thermionic emission are accelerated through high voltage and are focused onto a tungsten target. The accelerated electrons strike the tungsten target, transform into heat, and emit radiation called x-rays. So the correct sequence of energy transformation in the operation of an X-ray tube is Option C.