A Properties of Electromagnetic Radiation

The wave model fails to account for phenomena associated with the absorption and emission of radiant energy. For these processes, electromagnetic radiation can be treated as discrete packets of energy or particles called photons or quanta. These dual views of radiation as particles and waves are not mutually exclusive but are complementary. In fact, the energy of a photon is directly proportional to its frequency, as we shall see. Similarly, this duality applies to streams of electrons, protons, and other elementary particles, which can produce interference and diffraction effects that are typically associated with wave behavior. 

Richard R Feynman (1918-1988) was one of the most well-known and renowned scientists of the 20th century. For his role in the development of quantum electrodynamics, he was awarded the Nobel Prize in Physics in 1965. In addition to his many and varied scientific contributions, he was a skilled teacher, and his lectures and books had a major influence on physics education and science education in general. 

M Now we know how the electrons and photons behave. But what can I call it If I say they behave like particles I give the wrong impression also if I say they behave like waves. They behave in their own inimitable way, which technically could he called a quantum mechanical way. They behave in a way that is like nothing that you have ever. seen before.—R. P. Feynman  

The amplitude of an electromagnetic wave is a vector quantity that provides a measure of the electric or magnetic field strength at a maximum point in the wave. 

The period of an electromagnetic wave is the time in seconds that it takes for successive maxima or minima to pass a point in space. 

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