Assume electrons are accelerated through a potential difference of 20000 V inside a TV picture tube. What is the minimum wavelength that could be produced when the electrons strike the phosphor?
W = qV
The Attempt at a Solution
I use the equation above to find the speed, then plug it in de Broglie formula to find the wavelength but there is no such answer in the multiple choices....Maybe we need to know the work function of phospor?