1 Secondary emission: An electron, atom or molecule colliding with the surface of the cathode with enough energy can knock electrons out of the surface. 2  Photoelectric emission: Electrons can also be emitted from the electrodes of certain metals when light of frequency greater than the threshold frequency falls on it.
Best Answer: Do it yourself, often referred to by the acronym DIY, is a term used by various communities that focus on people (called do-it-yourselfers or DIYers) creating or repairing things for themselves without the aid of on-duty, work-stationed paid professionals.
DIY ethic - Music. 1  DIY music has its origins in the mid 1970s punk rock scene. [6] 2  DIY music bands do everything themselves or with independent collaborators, from album production to marketing and communication. 3  Advances in technology and lowering costs have progressively made it easier for bands to be independent.