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Class 12 ISC Notes 2018 : Physics Definitions etc (Little Flower School (LFS), Gorakhpur)

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Ishan Pathak
Little Flower School (LFS), Gorakhpur
6th-12th Physics, Chemistry, Biology, Biotech
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Modern Physics Photoelectric effect: Emission of electrons from a surface when a light is incident on it. Discovered by Frank Hertz Work Function: Minimum energy, associated with the surface, which when supplied to it through photons, results in just emission of photoelectrons. Threshold Frequency: Minimum frequency of light which when incident on the surface results in emission of photoelectrons Threshold Wavelength: Maximum wavelength of light which when incident on the surface results in emission of photoelectrons Stopping Potential: Minimum negative potential of the plate for which Photoelectric current I becomes zero Compton Effect: When a monochromatic beam of X rays is scattered by a metallic target. The scattered X Rays contain radiation not only of the same Wavelength as incident on the substance but also radiations of longer wavelengths. Laws of PE Effect: For a given PE surface, PE current is directly proportional to the intensity of incident light and is independent of its frequency KE of photoelectrons emitted is directly proportional to the frequency and independent of intensity of incident light Instantaneous effect ie the moment a photon falls on a surface, immediately an electron is emitted without a delay One to One Effect. A photon always causes emission of an electron De-Broglie Hypothesis: Postulated that material particles like electrons, photons may exhibit wave aspect. Accordingly a moving material particles behaves as waves and the wavelength associated with that particles is Matter waves: The waves associated with material particles are called matter waves Line Spectrum: The spectrum containing distinct lines over dark background is called the line spectrum Conclusions of Rutherford: Atom is hollow

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Tags : Physics, ISC Physics, Physics Notes, Notes, ISC Notes, Physics class 12 notes, Physics theory, ISC, CISCE  

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