Quanta, of electromagnetic radiation

As discussed previously, when an expl is irradiated with fast neutrons a N nucleus captures the incident fast neutron and ejects two slow neutrons. The resulting nucleus, N, is excited (radioactive) and decays with a io min half-life to stable C. In this last transition, a positron, 3<-, is emitted. Because of its opposite charge, the J3+ is strongly attracted by a nearby electron in the resulting collision, both the positron and electron are annihilated and in the process of annihilation, the masses of the colliding particles are converted into two 0.511 MeV quanta of electromagnetic radiation. These 7rays are what are detected to indicate the possible presence of an expl... 

Spectroscopy is possible because molecules exist in various energetic forms, those at lower energy being convertible into states of higher energy by absorption of discrete quanta of electromagnetic radiation. 

An instrument or suitable chemical system that allows one to determine the number of photons (or number of quanta) absorbed in a beam of electromagnetic radiation. 

A full explanation of the properties of light requires both the wave theory of electromagnetic radiation and the quantum theory. Most photochemical processes are best understood in terms of the quantum theory, which says that light is made up of discrete particles called quanta or photons. Each quantum carries an amount of energy, S, determined by the wavelength of the light, A. Equation 13.1, in which h is Planck s constant and c is the speed of light in a vacuum,... 

Max Planck in 1900 derived the correct form of the blackbody radiation law by introducing a bold postulate. He proposed that energies involved in absorption and emission of electromagnetic radiation did not belong to a continuum, as implied by Maxwell s theory, but were actually made up of discrete bundles—which he called quanta. Planck s idea is traditionally regarded as the birth of quantum theory. A quantum associated with radiation of frequency v has the energy... 

Particle properties of electromagnetic radiation Behavior that is consistent with radiation acting as small particles or quanta of energy. 

Photons Energy packets of electromagnetic radiation also known as quanta. 

To solve the paradox of blackbody was Planck s hypothesis (inspired) to considered also the radiation s energy as dependent on frequency, with a universal constant of proportionality (h-Planck s constant), as well as the universal Boltzmarm constant appears into the thermal energy. In addition quantified in bimdles of energy, which acknowledge as energy quanta in few words, Planck considered Ihe quantification of electromagnetic radiation as ... 

This dual wave/particle nature is the basis of the quantum theory of electromagnetic radiation, which states that radiant energy can be absorbed or emitted only in discrete packets called quanta or photons. The energy E of each photon is given by... 

Define and explain (a) electromagnetic radiation, (b) wave character of electromagnetic radiation, and (c) quanta (photons). 

The nature of electromagnetic radiation was described in terms of quanta or photons, and evidence for such a description is given from Planck s explanation of cavity radiation and the photoelectric effect. 

This classical description of electromagnetic radiation satisfactorily explained the properties of visible radiation in the ultraviolet region. According to equations derived for the behavior of electromagnetic radiation based upon the concept of continuous wave motion, the energy emitted by a blackbody source at finite temperature increases without limit as the wavelength of the radiation approaches zero. This behavior is not experimentally observed. However, if one assumes, as did Planck (1901), that radiation is emitted by a source in discrete units called quanta or photons and not continuously, then the behavior of radiation in the ultraviolet region can be satisfactorily explained. This concept of... 

---