Bragg's Law
Bragg's Law - Related Videos
08:48
Writing Bragg Gratings in Multicore Fibers
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Cited by 3 •
2016
We describe a technique for inscribing identical fiber Bragg gratings into each core of a multicore fiber. This is achieved by introducing an additional surface into the optical path to mitigate lensing by the curved surface of the fiber cladding.
02:53
Beer's Law - Concepts
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2020
Absorbance and Fluorescence When light hits a substance, it is either absorbed, transmitted, or reflected. Typically, a substance interacts with a range of wavelengths of light, each one interacting with the molecules or atoms differently. A substance may absorb a specific range of wavelengths, reflect another range of wavelengths, and transmit the other wavelengths of light. When a molecule absorbs light, the energy is used in four different ways: (1) translation, which causes the molecule to...
02:38
Third Law of Thermodynamics
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2020
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero. This limiting condition for a system’s entropy represents the third law of thermodynamics: the...
02:49
Second Law of Thermodynamics
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2020
In the quest to identify a property that may reliably predict the spontaneity of a process, a promising candidate has been identified: entropy. Processes that involve an increase in entropy of the system (ΔS > 0) are very often spontaneous; however, examples to the contrary are plentiful. By expanding consideration of entropy changes to include the surroundings, a significant conclusion regarding the relation between this property and spontaneity may be reached. In thermodynamic models, the...
10:12
Newton's Laws of Motion
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2023
Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA This experiment examines at various situations involving two interacting objects. First, the experiment examines the forces that two objects apply to one another while they collide. The objects are wheeled carts that have variable masses. The purpose of this experiment is to discover when the force the first cart exerts on the other is the same magnitude as the force the second cart exerts back on the first, as well...
FAQs
In nλ = 2d sin θ, n identifies the integer order of constructive interference, λ is the wavelength, d is the spacing between atomic planes, and θ is the incident angle. When three quantities are known, the relationship allows engineers to determine the fourth, making diffraction measurements useful for calculating lattice spacing and examining crystalline structure.
Reflections from adjacent atomic planes reinforce one another only when their path difference matches an integer multiple of the wavelength. At those angular conditions, the combined signal becomes measurable as a diffraction peak. Other angles do not satisfy the same relationship, so the resulting pattern contains discrete features that can be interpreted to study crystalline materials.
Because Bragg's Law links diffraction angle with interplanar spacing, a measured change in peak position can indicate a change in d. In engineering materials, altered lattice spacing can therefore provide evidence of strain or defects. This connection makes diffraction data valuable when evaluating how a material's internal crystal arrangement has changed.
An X-ray diffraction measurement records the angles at which crystalline material produces diffraction peaks. Engineers relate those angles to the known or selected wavelength using nλ = 2d sin θ, then determine interplanar spacings and interpret the resulting pattern. The calculated spacings support crystal-structure examination, phase identification, and evaluation of material condition.
Applied to metals, ceramics, semiconductors, and other crystalline solids, Bragg's Law helps determine crystal structures, identify phases, and measure lattice spacing. The same relationship also supports assessment of strain and defects. These outputs give engineers material-specific information for characterization rather than relying only on bulk descriptions of a solid.
The relationship connects measurable diffraction behavior with the atomic-plane spacing inside a material. Engineers can use that connection to characterize candidate materials, distinguish phases, and investigate strain or defects associated with material condition. Consequently, Bragg's Law contributes to materials selection, failure analysis, semiconductor development, and the study of metals and ceramics.