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Davisson and Germer Experiment The Davisson and Germer experiment was a 1923-27 experiment performed by Clinton Davisson and Lester Germer to establish the wave nature of slow moving electrons. This confirmed the de-Broglie hypothesis of wave-particle duality. Experimental setup of Davisson and Germer Experiment The Davisson and Germer experiment is contained in a vacuum chamber…
Radiation Pressure Radiation Pressure :- Maxwell predicted that an electromagnetic wave carries momentum() and energy() and when this electromagnetic wave is absorbed/reflected by a surface, it would experience a force in a direction perpendicular to the surface. Maxwell’s prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures using…
A light beam of wavelength 400 nm is incident on a metal plate of work function 2.2 eV. A particular electron absorbs a photon and makes two collisions before coming out of the metal. Assuming that 10% of the extra energy is lost to the metal in each collision, find the kinetic energy of this…
An ultraviolet light of wavelength 2000 angstrom causes photo emission from a surface. The stopping potential is 2 volt. Find the work function in electron volt and the maximum speed of the ejected photoelectrons. An ultraviolet light of wavelength 2000 angstrom…… :- Solution :- Using Einstein photoelectric equation, Now, as ⇒ vmax = 8.4…
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A photon with energy of 4.9 eV ejects photoelectrons from tungsten. When the ejected electron enters a constant magnetic field of strength B = 2.5 mT at an angle of 60∘ with the field direction, the maximum pitch of the helix described by the electron is found to be 2.7 mm. Find the work function…
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When a beam of 10.6 eV photons of intensity 2Wm-2 falls on a platinum surface of area 1.0×10−4 m2 and work function 5.6 eV, 53% of the incident photon eject photoelectrons. Find the number of photoelectrons emitted per second and their minimum and maximum energies (in eV). When a beam of 10.6 eV photons of intensity……. :- Solution….
State Heisenberg Uncertainty Principle State Heisenberg Uncertainty Principle :- According to Heisenberg it is impossible to measure the position and momentum of a particle simultaneously with 100% accuracy. This is called Heisenberg Uncertainty Principle. If Δx and Δp are the uncertainties in determining the position and momentum of the particle simultaneously, then …
समान्तर क्रम संयोजन प्रतिरोधों के समान्तर क्रम संयोजन में :- प्रत्येक प्रतिरोध के सिरों पर विभवान्तर समान होता है। प्रत्येक प्रतिरोध में से प्रवाहित धारा प्रतिरोध के मान के व्युत्क्रमानुपाती होती है। परिपथ में प्रवाहित कुल धारा प्रत्येक प्रतिरोध में से अलग-अलग प्रवाहित धाराओं के योग के बराबर होती है। अतः समान्तर क्रम…
श्रेणी क्रम संयोजन प्रतिरोधों के श्रेणी क्रम संयोजन में :- प्रत्येक प्रतिरोध में से प्रवाहित धारा समान होती है। प्रत्येक प्रतिरोध के सिरों पर विभवान्तर प्रतिरोध के मान के सीधे समानुपाती होता है। V1 = IR1, V2 = IR2 , V3 = IR3, प्रतिरोधों के सिरों पर विभव का योग परिपथ में प्रयुक्त विभव…
प्रतिरोधों का संयोजन प्रतिरोधों का संयोजन :- विद्युत परिपथों में प्रतिरोधों को दो प्रकार से संयोजित किया जाता है :- श्रेणी क्रम संयोजन समान्तर क्रम संयोजन