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Deakin Research Online - DRO
Deakin Research Online - DRO

FIFTH GRADE PHYSICS - Math/Science Nucleus
FIFTH GRADE PHYSICS - Math/Science Nucleus

... Emphasize that this segment concentrates on visible light which is a part of the electromagnetic wave spectrum. Review how light carries energy in tiny packets of electromagnetic radiation called photons. Light travels at 296,000 meters per second or 186,000 miles per second and doesn't need a mediu ...
Waves Unit: Worksheet 4
Waves Unit: Worksheet 4

... 7) describe diffraction as the bending of a wave around an obstacle or an edge. This can be described in conjunction with interference to describe diffraction patterns. Part B: Sound waves and Light waves. Students should be able to 1) identify the source of electromagnetic radiation as accelerating ...
New Theories of Gravitation and Particle Model Chongxi Yu
New Theories of Gravitation and Particle Model Chongxi Yu

... Gravitation is a natural phenomenon and all things are brought toward one another by gravitation. Modern work on gravitational theory began with the work of Galileo Galilei in the late 16th. In 1687, Isaac Newton published Newton’s law of universal gravitation, which postulates that gravity is a for ...
The absorption spectra of very small CdS or ZnS particles (1
The absorption spectra of very small CdS or ZnS particles (1

Experiment 2 Chemistry with Light – Using Photons as Reagents
Experiment 2 Chemistry with Light – Using Photons as Reagents

Electrical potential energy
Electrical potential energy

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Electrochemistry and Electrogenerated

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exercise 10

Waves - b5z.net
Waves - b5z.net

H3AsO4 + 3 I- + 2 H3O+ H3AsO3 + I3- + H2O
H3AsO4 + 3 I- + 2 H3O+ H3AsO3 + I3- + H2O

Electron Dynamics on Surfaces and Nanostructures November 05
Electron Dynamics on Surfaces and Nanostructures November 05

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Probing the energy levels in hole-doped molecular

Moving Electrons
Moving Electrons

... magnetic domains of a cassette tape. To do this, cut a short (3-cm) section of tape and staple or tape it to a 3 × 5 note card. Then stroke a permanent magnet over the strip of cassette tape several times in the same direction. Now see if the permanent magnet attracts or repels the strip of cassette ...
AP* Physics B OPTICS
AP* Physics B OPTICS

printer-friendly version
printer-friendly version

... with microscopic particles within a material. Electromagnetic radiation, more commonly called light, is also commonly referred to as an energy form. But, just as with heat, light is a process that transfers energy. Besides being a wave, light also has a particle nature, where each particle of light ...
Carbene Singlets, Triplets, and the Physics that
Carbene Singlets, Triplets, and the Physics that

... (molecular, in the likely event of two molecules interacting) orbitals, resulting in a mixing of pure orbitals. This mixing can either yield a bonding or an anti-bonding orbital, as seen in the interaction diagram (see figure 3). Orbital mixing diagrams like these are often qualitative, and while kn ...
Electric Potential - Little Shop of Physics
Electric Potential - Little Shop of Physics

mopea030
mopea030

Lightning Room education kit: Classroom activities
Lightning Room education kit: Classroom activities

The Quantum Theory of Atoms - Electrostatics and Vibrations
The Quantum Theory of Atoms - Electrostatics and Vibrations

... The total charge, dipole moment, quadrupole moment, and the polarisability often provide the best descriptions of the charge distribution* (charges are not static) in a molecule. *(charges are not static points and we must speak of a charge distribution) For example, in the case of a linear molecule ...
ISNS3371_032907_bw
ISNS3371_032907_bw

... Most common method of polarization uses a Polaroid filter - made of a special material capable of blocking one of the two planes of vibration of an electromagnetic wave. When unpolarized light is transmitted through a Polaroid filter, it emerges with one-half the intensity and with vibrations in a s ...
Incoherent pair background processes with full polarizations at the ILC
Incoherent pair background processes with full polarizations at the ILC

Opticks
Opticks

P2 Foundation Revision Pack
P2 Foundation Revision Pack

< 1 ... 26 27 28 29 30 31 32 33 34 ... 208 >

Photoelectric effect

The photoelectric effect is the observation that many metals emit electrons when light shines upon them. Electrons emitted in this manner can be called photoelectrons. The phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.According to classical electromagnetic theory, this effect can be attributed to the transfer of energy from the light to an electron in the metal. From this perspective, an alteration in either the amplitude or wavelength of light would induce changes in the rate of emission of electrons from the metal. Furthermore, according to this theory, a sufficiently dim light would be expected to show a lag time between the initial shining of its light and the subsequent emission of an electron. However, the experimental results did not correlate with either of the two predictions made by this theory.Instead, as it turns out, electrons are only dislodged by the photoelectric effect if light reaches or exceeds a threshold frequency, below which no electrons can be emitted from the metal regardless of the amplitude and temporal length of exposure of light. To make sense of the fact that light can eject electrons even if its intensity is low, Albert Einstein proposed that a beam of light is not a wave propagating through space, but rather a collection of discrete wave packets (photons), each with energy hf. This shed light on Max Planck's previous discovery of the Planck relation (E = hf) linking energy (E) and frequency (f) as arising from quantization of energy. The factor h is known as the Planck constant.In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905 Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets. This discovery led to the quantum revolution. In 1914, Robert Millikan's experiment confirmed Einstein's law on photoelectric effect. Einstein was awarded the Nobel Prize in 1921 for ""his discovery of the law of the photoelectric effect"", and Millikan was awarded the Nobel Prize in 1923 for ""his work on the elementary charge of electricity and on the photoelectric effect"".The photoelectric effect requires photons with energies from a few electronvolts to over 1 MeV in elements with a high atomic number. Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality. Other phenomena where light affects the movement of electric charges include the photoconductive effect (also known as photoconductivity or photoresistivity), the photovoltaic effect, and the photoelectrochemical effect.
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