Capacitance relates specifically to CCD's. The CCD relies on the photoelectric effect to liberate electrons.
Albedo is the ratio of reflected radiation to incident radiation. It is REFLECTED radiation, questions will try to catch you out with emitted radiation. A body can either absorb or reflect light. High albedo (90%) means a lot of the light is reflected (e.g Snow).
Emissivity is the ratio of the of the energy radiated by a particular body/material to the energy radiated by a black body at the same temperature.
