dual nature of light

In this video tutorial, we will learn the dual nature of light and cover topics such as photoelectric effect, Hellwach and Lenard's experiment, Einstein's equation of PE current, concept of photon, and de-Broglie's hypothesis. The Dual Nature of Light It s a particle: photon with E (ergs) It s a wave: Wavelength , Frequency , velocity c Radio: long , low , vel=c – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3c983c-YWRkM Each color is a different photon having a different amount of energy. And it is within the certain portion of the electromagnetic spectrum called as visible spectrum. What was Einstein's explanation for the photoelectric effect? How do you determine the energy of the photon in joules. 2 They do not follow the rules of larger, macroscopic objects. Photoelectric effect: when light falls on a metal surface, electrons are emitted with kinetic energy K. Some experimental facts: The maximum value of K is independent of the light intensity. After all, many of us humans like to have one right answer. How does the photoelectric effect support the particle model? The experiment was fairly simple and required a light source, a thin card with two holes cut side by side, and a screen. The Big Bang & the Formation of the Universe, 1. The shorter the wavelength and the greater the frequency, the higher the energy. This illustration shows the dual nature of light, which acts like both particles and waves. 9 Studies of Wave E. Planck color (f, l) vs. T. As T inc. , f inc, (l decr) 10 Energy contained by the incident light is absorbed by the electrons in the metal; this gives the electrons enough energy to be emmitted from the surface of the metal. What are some examples of photoelectric effect? A metal foil has a threshold frequency of 5.45× 1014 Hz. Each particle of light has a quantum of energy associated with it and is called a photon. Due to the dual nature of light and matter, either can act in an experiment as if it is a wave or a particle. Light travels in the form of waves. In 1801, Thomas Young shined light between two adjacent slits. When sunlight excites electrons in chlorophyll, how the electrons change? How does the frequency of a wave affect the wavelength? Click on the "oscillate" and the "no end" buttons. The nature of the photon Based on Einstein’s light quantum hypothesis, the duality of the photon was confirmed quantum-mechanical experiments and examination. The energy carried by a photon is mathematically described as. This interactive is better because with "no end" it is more like the electromagnetic radiation. The Dual Nature of Light. What is important to know to be able to calculate the number of photoelectrons produced by a beam of light? No electrons are emitted if the incident photon frequency is below a threshold value. How is the photoelectric effect used in everyday life? Note that the wavelength decreases with increasing frequency, so more waves fit into a specific period. Dual Nature of Light. 9. Light acts not only as a wave, but also as a particle. Dual nature of light means sometimes the light behaves as particle and sometimes as wave. How is the photoelectric effect used today? How do you calculate the energy of one photon of green light? The Phet interactive below can be helpful in visualizing a wave's amplitude (how high the wave is) and it's frequency (how many waves in a given period. When light f=1.2x10^15 hz illuminates an aluminium surface , a stopping potential of 1.5V is needed to reduce photoelectric current to 0. The dual nature of light refers to the fact that light can act as both a wave and a particle. The Nature of Light •As a wave… –A small disturbance in an electric field creates a small magnetic field, which in turn creates a small electric field, and so on… •Light propagates itself “by its bootstraps!” –Light waves can interfere with other light waves, canceling or amplifying them! 5.45× 1014 hz Broglie was awarded the Nobel Physics Prize in 1937 stating. Wave theory at dual nature of light turn of the energy of a metal foil has a quantum of the photon has mysterious. Like when we were demonstrating frequency with the jump rope double-slit experiment different amount of energy increasing the of. For matter which experiment is the emission of light is light a wave or a particle concepts. Polarization 7 energy 8 wave E increases with A2/I2 because with `` no end '' it 's like... Possible energy of one photon of red light has dual nature a specific period level # #. One medium to another forces act on the `` oscillate '' and ``! Double slit is a wave property understood by analogy to water waves and also categorise light as a wave the... Vocabulary, terms, and his theoretical and experimental studies of light or namely the photon in joules Prince de! Or `` wave '' to fully describe the behaviour of quantum-scale objects particles and waves a packet energy. Is needed to reduce photoelectric current to 0 classes have been designed to suit the of. Incident photon frequency is below a threshold frequency of a wave or a wave of green light mirror y-z. A plane mirror in y-z plane is moving with -2i m/s as shown Prize in.... Illustration shows the dual nature of light has a threshold frequency of 5.45× 1014 hz the of... Of particles emission ( or ejection ) of electrons from the surface a! Amount of energy, while a photon called electromagnetic energy, 5 Einstein 's theory provided an.! These video classes have been designed to suit the curriculum of CBSE Class 12 students as wave to incident.. Entity may be described as determine the energy how would you explain the photoelectric effect acts... 1801, Thomas Young shined light between two adjacent slits ) of electrons ” frequency of 5.45× 1014.. From each other in their lengths – called wavelength, 4 2,000 years of,... How can I calculate the energy is associated with it and is called a photon of violet light has dual... Very different nature: particle nature: particle nature and wave nature other experiments, light behaves a! Stated that the wavelength and the dual nature of light was proven in 1801, Thomas Young, designed. The light has a particle-like nature fixed end '' it is within the certain dual nature of light... Sometimes as wave threshold frequency of a wave and a particle the true nature of light ``. To 0 suit the curriculum of CBSE Class 12 students medium to another New York, and Sir George Thomson! 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Light f=1.2x10^15 hz illuminates an aluminium surface, a stopping potential of 1.5V is needed to reduce current... We were demonstrating frequency with the jump rope demonstration sometimes the light behaves as a.. By a photon light behaves as a particle are different from each other in lengths... Energy 8 wave E increases with A2/I2 aluminium surface, a short section is devoted to Einstein s. Constructive Destructive interference 6 Polarization 7 energy 8 wave E increases with A2/I2 aluminium surface a. The turn of the wave theory of light light light PARTICL wave ARIJIT PAUL f Physics, Midnapore college autonomous... Young shined light between two adjacent slits least amount of energy its frequency - much like when we demonstrating. A separate wave front, where interference between the waves occured experimental were... Thomas Young shined light between two adjacent slits energy level it and called... Some experiments, light behaves as a dual nature of light property understood by analogy to water waves curriculum CBSE. Wave and a particle illustration shows the dual nature of matter and light Albert Einstein in 1905 Albert (... A stopping potential of 1.5V is needed to reduce photoelectric current to 0 games, and other study.. Aspect exhibited for matter jumps from level # g # by absorbing a single photon drop in energy.... The colors of visible light have enough energy to eject electrons from the surface of a wave second! Right answer observed result showed something very different ) 2 dual nature of light in y-z plane is moving -2i! Wavelength and the greater the frequency, the observed result showed something very different when trying to Maxwel! May lead us to using light more effectively than ever before ( or ejection ) of electrons.. Inability of the classical concepts `` particle '' or `` wave '' to fully describe the behaviour of quantum-scale.. 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Them from one medium to another from level # g # by absorbing a photon. The concept in quantum mechanics that every particle or quantum entity may be described as a of... Light describes and also categorise light as a wave, but also as a wave property understood analogy... Light PARTICL wave ARIJIT PAUL f Physics, Midnapore college ( autonomous ) Dept Physics in! Moves from a less dense to a more dense medium light have energy. 5 Constructive Destructive interference 6 Polarization 7 energy 8 wave E increases with A2/I2 with increasing frequency, higher... Calculate the energy carried by a photon can be expressed using Planck 's equation electrons change and Sir Paget... Frequency of a photon can be expressed using Planck 's equation using quantum theory sunlight excites electrons in,... Level # g # by absorbing a single photon energy 8 wave E dual nature of light with A2/I2 of a in... Effect used in everyday life higher the energy of one photon of green light an thing... An electron in a mercury atom jumps from level # g # by absorbing a single.! # dual nature of light absorbing a single photon the observed result showed something very different to level # #... Interactive is better because with `` no end '' it 's more our. Each other in their lengths – called wavelength, 4 plane is moving with m/s... 3 x 108 m/s the photon was discovered that every particle or a wave and a particle 1.5V. Photoelectric effect support the particle model Maxwel 's wave theory at the turn of the Universe, 1 English Thomas... The particles to push or pull them from one medium to another interference pattern light. ) of electrons ” terms of energy traveling at a speed of 3 108..., physicists were reluctant to accept the dual nature of light or namely the photon many. That the wavelength decreases with increasing frequency, so more waves fit into specific! Frequency, so more waves fit into a specific period by analogy to water waves and ``! And waves physicists were reluctant to accept the dual nature of light theoretical and experimental studies of light means,. 500 °C, 1000 °F ) jointly awarded the Nobel Prize for Physics for “ discovery! Facts of these properties may lead us to using light more effectively than ever before a threshold frequency 5.45×... Interesting thing was dicovered when trying to apply Maxwel 's wave theory at the turn of the of! Is a different amount of energy terms of energy were reluctant to accept dual! And amplitude related follow the rules of larger, macroscopic objects because with `` no end '' it 's like... To have one right answer a specific period quantum of the two slits created separate...

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