Stuff I have forgotten!

Capacitance relates specifically to CCD's. The CCD relies on the photoelectric effect to liberate electrons.

To get the equation for Escape Speed. Equate KE with Work done using Newton's Universal law of gravitation and solve.

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.