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- Dictionaryphase/feɪz/
noun
- 1. a distinct period or stage in a series of events or a process of change or development: "the final phases of the war" Similar
- 2. each of the aspects of the moon or a planet, according to the amount of its illumination, especially the new moon, the first quarter, the full moon, and the last quarter. Similar
verb
- 1. carry out (something) in gradual stages: "the work is being phased over a number of years"
- 2. adjust the phase of (something), especially so as to synchronize it with something else: "about 70% of the reflections were phased by this method"
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Aug 12, 2018 · One twist. The phase difference is meaningful only within the period of a wave. In case of a second hand of a clock, there's no point in talking about the phase difference of more than 60 seconds. A phase difference of 61 seconds is the same as phase difference of 1 second.
We say that two functions of the same frequency are "out of phase" if this above condition is not met. We can specify how much they are out of phase by using the phase angle $\phi$. If two functions of the same frequency are off by a phase angle of $\frac{\omega t}{2}$ then the crest of one wave will always match up with the trough of another.
Feb 8, 2017 · A phase constant of ϕ means that each value of the signal happens ϕ amount of time earlier. If the signal has a beginning, then a phase constant of ϕ means the signal occurs that much sooner. The phase constant is particularly significant when you have multiple signals, because having different phases can cause destructive interference.
May 24, 2015 · The velocity phase space is not, in general, a symplectic manifold. To be able to ascertain how the phase flow transforms a volume, you need to have a structure that defines volume, which in the momentum phase space, the symplectic form does, while in the velocity phase space, there is no such canonical structure.
Feb 22, 2017 · Because, as the asker has mentioned, they are continuously connected in the phase diagram through the "supercritical" regime. By definition, two states of matter are in the same phase if they can be smoothly deformed to each other without going through phase transitions. Historically, liquid and gas are named as different phases (by mistake ...
So the phase difference is pi/2. Infact, cos wave is just the sine wave phase-shifted. If two waves have zero phase difference, then their crests occur at the same time and so do their troughs. Its like moving together. They will add up (constructive interference). For only one wave, phase difference means how much the wave is shifted from the ...
Aug 3, 2023 · For progressive waves we define phase difference as difference in phase angle between two points. However for standing waves, the phase difference becomes something else. We say two points are in phase when they travel in the same direction and with the same amplitude. So why have the definitions changed here?
Feb 11, 2018 · The "textbook" definition is: "A phase is a form of matter that is uniform throughout in both chemical composition and physical state." Does physical state means macroscopic intensive proprieties, like temperature? So a body with a temperature gradient doesn't have a phase? Is the term “phase” only significant at equilibrium?
Now, if one is more interested in the criticality involved in some phase transitions, then he won't probably find it here as they are principally found in second order phase transitions. One can understand why this is the case as basically a second order phase transition does not display a jump in the order parameter at the transition. Hence ...
Jul 25, 2018 · In fact, one can show that, if we limit the Taylor expension of $\omega$ to first order, called linearization, as done in the wiki, it is impossible to explain a packet distortion, because both zero-th and first order terms are constant, and they define phase and group velocity respectively. So, by linearizing, we "force" the group velocity to ...
