Question

In an experiment to study the photoelectric effect, a scientist measures the kinetic energy of ejected electrons as a function of the frequency of radiation hitting a metal surface. She obtains the following plot. The point labeled “υ₀” corresponds to light with a wavelength of 542 nm. (a) What is the value of υ₀ in s^–1? (b) What is the value of the work function of the metal in units of kJ/mol of ejected electrons? (c) Note that when the frequency of the light is greater than υ₀, the plot shows a straight line with a nonzero slope. What is the slope of this line segment?