Our purpose now is to draw attention to a secondary use for the retarding-grid type of instrument, namely, the production of a photo-ion kinetic energy spectrum for a gas.

Potential energy transforms to kinetic energy on the way down. ... This is known as solar power and is a form of renewable energy. (Dennis Hallinan / Alamy Stock Photo) End of image gallery.

Learn how electricity can be generated from renewable and non-renewable energy sources. BBC Bitesize Scotland article for upper primary 2nd Level Curriculum for Excellence.

IN a series of experiments carried out in Prof. O. W. Richardson's laboratory at King's College, London, I have attempted to measure the velocity of the photo-electrons set free from a metal under ...