In a photoelectric effect experiment, a metal with a work function of 5.4 eV is used.

a) What is the maximum wavelength of light that can be used to free electrons from the metal? Answer in micrometres to two decimal places.

b) If light with a wavelength 1 micron (or 10^-6 m) is used, what is the speed of the ejected electrons compared to the speed of light? Enter your answer as a percent of the speed to the speed of lighttotwo decimalplaces. For instance, if the speed is 1 x 10⁸ m/s, enter this as 100 x (1 x 10⁸ m/s)/(3 x 10⁸ m/s)=33.33.