7.) Photosensitive surfaces are not necessarily very efficient. Suppose that the fractional efficiency of a Cesium surface is 1.0 x 10-6, that is, one electron is released for every 106 photons striking the surface. What is the photocurrent from such a Cesium surface if it is illuminated with 600 nm light from a 2.0 mW laser and all the electrons produced take part in the charge flow. Repeat the problem for 700 nm light.

7.) Photosensitive surfaces are not necessarily very efficient. Suppose that the fractional efficiency of a Cesium surface is 1.0 x 10-6, that is, one electron is released for every 106 photons striking the surface. What is the photocurrent from such a Cesium surface if it is illuminated with 600 nm light from a 2.0 mW laser and all the electrons produced take part in the charge flow. Repeat the problem for 700 nm light.