Chapter 8, Problem 73P

X-rays are produced by striking a target with a beam of electrons. Prior to striking the target, the electrons are accelerated by ail electric field through a potential energy difference:

$△U=-e△V$,

where e is the charge of an electron and $△V$ is the voltage difference. If $△V$ = 15,000 volts, what is the minimum wavelength of the emitted radiation?