|
Stoletov's Law
Stoletov's law (or the first law of photoeffect) for photoelectric effect establishes the direct proportionality between the intensity of electromagnetic radiation acting on a metallic surface and the photocurrent Photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power. The photocurrent may occur as a result of the photoelectric, photoemissive, or photovoltaic effect. The photo ... induced by this radiation. The law was discovered by Aleksandr Stoletov in 1888. (Abstract in Beibl. Ann. d. Phys. 12, 723, 1888). Notes Electrical phenomena {{electric-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photoelectric Effect
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission. The experimental results disagree with classical electromagnetism, which predicts that continuous light waves transfer energy to electrons, which would then be emitted when they accumulate enough energy. An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency—regardless of the light's intensity or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electromagnetic Radiation
In physics, electromagnetic radiation (EMR) consists of waves of the electromagnetic field, electromagnetic (EM) field, which propagate through space and carry momentum and electromagnetic radiant energy. It includes radio waves, microwaves, infrared, Light, (visible) light, ultraviolet, X-rays, and gamma rays. All of these waves form part of the electromagnetic spectrum. Classical electromagnetism, Classically, electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric field, electric and magnetic fields. Depending on the frequency of oscillation, different wavelengths of electromagnetic spectrum are produced. In a vacuum, electromagnetic waves travel at the speed of light, commonly denoted ''c''. In homogeneous, isotropic media, the oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave. The position of an electromagnetic wave w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metall
Since the debut of the first '' Mega Man'' video game in 1987, numerous characters have been introduced into the series. Overview Key: = Does Not Appear List indicator(s) * A dark grey cell indicates that the character was not in the property or that the character's presence in the property has yet to be announced. * A Main indicates a character had a starring role in the property. * A Recurring indicates the character appeared in two or more times within the property. * A Guest indicates the character appeared once in the property. ''Classic Mega Man'' characters Main characters Mega Man DLN-001 Mega Man, known in Japan as is the protagonist of the original ''Mega Man'' series. Originally created as a lab assistant named "Rock" by Dr. Light, he was modified for battle after Dr. Wily reprogrammed the original Robot Masters to take over the world. Due to his Variable Weapons System, he can copy the weapon of any Robot Master and use it as his own. Dr. Light Doctor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photocurrent
Photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power. The photocurrent may occur as a result of the photoelectric, photoemissive, or photovoltaic effect. The photocurrent may be enhanced by internal gain caused by interaction among ions and photons under the influence of applied fields, such as occurs in an avalanche photodiode (APD). When a suitable radiation is used, the photoelectric current is directly proportional to intensity of radiation and increases with the increase in accelerating potential till the stage is reached when photo-current becomes maximum and does not increase with further increase in accelerating potential. The highest (maximum) value of the photo-current is called saturation current. The value of retarding potential at which photo-current becomes zero is called cut-off voltage or stopping potential for the given frequency of the incident ray. Photovoltaics The generation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleksandr Stoletov
Alexander Grigorievich Stoletov (russian: Алекса́ндр Григо́рьевич Столе́тов; 10 August 1839 – 27 May 1896) was a Russian physicist, founder of electrical engineering, and professor in Moscow University. He was the brother of general Nikolai Stoletov. Biography Alexander Stoletov defended his doctoral dissertation in 1872 and became professor at Moscow University a year later. After defending his dissertation he became a renowned scientist worldwide. He attended the opening ceremony of the physical laboratory in Cambridge in 1874, and represented Russia at the first World Congress of Electricity in Paris in 1881, where he presented his work on links between electrostatic and electromagnetic values. Contribution to science His major contributions include pioneer work in the field of ferromagnetism and discovery of the laws and principles of the outer photoelectric effect. Achievements of Alexander Stoletov include: Magnetism (1871–1872) * St ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
