2. Suppose you perform an experiment on the photoelectric effect, using light with a frequency high enough to eject electrons. If the intensity of the light is increased while the frequency is held constant, describe whether the following quantities increase, decrease, or stay the same. (/3) a. The maximum kinetic energy of an ejected electron. b. The number of electrons ejected per second C. The electric current in the phototube, 3. How many photons per second are emitted by a monochromatic light bulb (650 nm) that emits 25 W of power? (/2) 4. The maximum wavelength an electromagnetic wave can have and still eject an electron from a copper surface is 264 nm. What is the work function of a copper surface? ( /1) 5.Aluminum and calcium have work functions of 4.28 ev and 2.87 ev respectively. (/3) a. Which metal requires higher frequency light to produce photoelectrons? Explain. b Calculate the minim frequency that will produce photoelectrons from each surface. 6. Two beams of light with different wavelengths (), > An ) are used to produce photoelectrons from a given metal surface. (/4) a. Which beam produces photoelectrons with a greater kinetic energy? Explain. b. Find the maximum Ex for cesium (W = 1.9 eV) if),= 620 nm and An - 410 nm. 7. White light, with frequencies ranging from 4.00 x 10# Hz to 7.90 x 10 Hz, is incident on a potassium surface ( W - 2.24 eV). Find: the maximum Ek of photoelectrons ejected from this surface b. the range of frequencies for which no electrons are ejected