the maximum wavelegnth for which an electromagnetic wave can eject electrons from a platinum surface is 196 nm. when radiation with a wavelength 141 nm shines on the surface, what is the max speed of the ejected electrons?
The Attempt at a Solution
K=1/2mv^2 to find v
but i dont know what numbers to plug in as f?? and Φ??
i tried putting in the f values i found using the given wavelengths but i kept getting K=0
thank you for your time