In an experiment on an unknown photoemissive metal
PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
In an experiment on an unknown photoemissive metal, monochromatic light of wavelength 400 nm is directed onto the metal surface in vacuum. A potential difference is applied such that the collector plate is negative relative to the emitter. When the potential difference reaches −1.10 V, the photocurrent falls to zero.
(a) Determine the maximum kinetic energy, in electron-volts, of the emitted electrons.
(b) Using the constants below, calculate the work function of the metal in electron-volts: c=3.00×108 m s−1, h=6.63×10−34 J s, and e=1.60×10−19 C.
(c)