Wave theory of electromagnetic radiations explained the phenomenon of interference, diffraction and polarization of light. On the other hand, Quantum theory of electromagnetic radiations successfully explained the photoelectric effect, Compton effect, black body radiation e.t.c. It means that radiation sometimes behaves as a wave and sometimes as a particle. Wave Nature of Matter(Particles): De-Broglie Hypothesis:- […]
Photoelectric effect gave evidence that light consists of packets of energy. These packet of energy is called light Quantum that are associated with particles named as photons. So photons confirm particle nature of light. Characteristic Properties of Photons: The following characteristic of photon which proves particle nature of light. (I) In the interaction of radiation
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According to Planck’s Quantum theory, light radiations consists of tiny packets of energy called quanta. One quantity of light radiation is called a photon which travels with the speed of light. The energy of a Photon is E= hv Where h is Planck’s Constant and v is frequency of light radiation. When a photon of energy fall
The laws of photoelectric emission are as follows (I) For a given material and a given frequency of incident radiation, the photoelectric current or number of photoelectrons ejected per second is directly proportional to the intensity of the incident light. (II) For a given material and frequency of incident radiation, situation current is found to
Photoelectric Effect: It is the phenomenon of emission of electrons from the surface of metal, when radiations of suitable frequency fall on it. Or The phenomenon of converting light energy into electrical energy is called Photoelectric effect. The emitted electrons are called photoelectrons and the current, so produced is called photoelectric current. Threshold Frequency: For
Electron Emission: In metals the electrons in the outer shells are loosely bound to the atoms, hence they are free to move easily the metal surface but I cannot leave the metal surface. Such electrons are called free electrons. These free electrons can be emitted from the metals, if they have sufficient energy to overcome
Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Refracting Telescope(Astronomical Telescope): An astronomical telescope is an optical instrument which is used for observing distinct image of heavenly bodies like star, planets etc. Refracting telescope has two convex lenses coaxially separated by some distance. Objective is of large aperture and large focal length so that it can
Chapter-9|Ray Optics and Optical Instrument|NCERT 12th Physics: Compound Microscope: A compound microscope consists of two convex lenses coaxially separated by some distance. The lens nearer to the object is called the objective. The lens through which the final image viewed is called the eyepiece. Object is placed beyond first focus of objective which formed inverted
