The Larmor formula is used to calculate the power radiated by a nonrelativistic electron as it accelerates. It was first derived by J. J. Larmor in 1897. // Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. ... Properties The electron is a fundamental subatomic particle which carries a negative electric charge. ... Sir Joseph Larmor (July 11, 1857 - May 19, 1942), an Irish physicist and mathematician, researched electricity, dynamics, and thermodynamics. ...

When accelerating or decelerating, any charged particle (such as an electron) radiates away energy in the form of electromagnetic waves. For velocities that are small relative to the speed of light, the total power radiated is given by the Larmor formula:

Background

When a charged particle accelerates, it must either emit or absorb a photon, forming a pulse of electromagnetic radiation. Often, in practice, charged particles oscillate back and forth continuously, sending off one pulse after another in a periodic pattern.

speed = wavelength period or c = λ T ,

where λ (“lambda”) is the standard symbol for wavelength, T is the standard symbol for period, and c is the speed of light.