using the experimental apparatus shown in Figure, when ultraviolet light with a wavelength of 240 nm shines on a particular metal plate, electrons are emitted form plate 1, crossing the gap to plate 2 and causing a current to flow through the wire connecting the two plates. The battery voltage is gradually increased until the current in the ammeter drops to zero, at which point the battery voltage

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 corresponds to light with a wavelength of . (a) What is the value of in What is the value of the work function of the metal in units of of ejected electrons? (c) What happens when the metal is irradiated with light of frequency less than ? (d) Note that when the frequency of the light is greater than , the plot shows a straight line with a nonzero slope. Why is this the case? (e) Can you determine the slope of the line segment discussed in part (d)? Explain.