waves have phases right?
can someone please tell me what the phases of waves are and a SHORT, SWEEEEET, and SIIMPLE definition of each wave phase?
tank u
2007-12-09 03:58:59 · 5 answers · asked by luvalwayz_divya 1 in Science & Mathematics ➔ Physics
By definition a wave starts at 0° phase when it crosses the zero amplitude line from negative to positive = increasing slope at zero.
It reaches it's top positive value at 90° phase before starting coming down.
When it is crossing the zero line from positive to negative it has reached its 180° phase point. The maximum negative value is at 270° and when it is coming up to zero again from the negative side it has reached its 360° or 0° point again.
P.S.:
Ron J. below is nearly correct - except the case where the direction of the two waves are exactly opposite is at 180° and not at 90° phase shift between the two waves.
2007-12-09 04:07:57 · answer #1 · answered by Ernst S 5 · 0⤊ 0⤋
Not sure what you mean by "phases" since not all waves undulate (move up and down) like ripples in a pond. Sound waves for instance are compression waves, and you just see bands of density, no ripples.
All waves start at some value, reach a peak or trough, then return to the start value. Each time this happens, we call it a cycle. The distance the wave travels to complete one cycle is called the wavelength. How many cycles complete in one second is the frequency....which is why some refer to frequency as "cycles per second."
2007-12-09 04:23:27 · answer #2 · answered by Charles M 6 · 0⤊ 0⤋
The phase of a wave refers to the "part" of the wave, such as its "crest" (high part) or "trough" (low part), etc.
Phases are expressed in terms of an angle between 0° and 360° (this has nothing to do with the actual angle at which the wave may be traveling; it's just a notation that makes the math easier).
The wave's "crest" corresponds to a phase of 90°, and its "trough" corresponds to a phase of 270°.
Halfway between trough and crest (on the way up) is a phase of 0°; and halfway between crest and trough (on the way down) is a phase of 180°.
So, the phase is a way of expressing the exact position within a single wavelength.
If you have two waves of the same wavelength traveling together, then they may be "in phase" (which means the crests of wave "A" line up exactly with the crests of wave "B"); or they may be "180° out of phase" (which means the crests of wave "A" line up with the TROUGHS of wave "B"). Or they may be out of phase by some different amount; for example if they're "10° out of phase," that means you would have to shift wave "A" by 10/360 of a wavelength to get it to "line up" with wave "B". This "phase difference" between two co-traveling waves has an important effect on how the waves behave.
2007-12-09 04:36:27 · answer #3 · answered by RickB 7 · 0⤊ 0⤋
phases are about how 2 (or more )waves are "lined up"
If they are in phase they go up and down (oscillate)at the same time - both move up together or down together, the 2 waves fit on top of each other. When they move out of phase they no longer overlap exactly. At 90 degrees out they oscillate in completely opposite directions (one wave is moving up and the other down)
between these two extremes they don't exactly overlap.
2007-12-09 04:14:02 · answer #4 · answered by Ron J 5 · 0⤊ 0⤋
A. A full-wave, single-phase bridge rectifier uses one-fourth as many diodes as a standard full-wave, single-phase rectifier. A bridge rectifier has 4 diode internal to it, a standard full wave bridge rectifier uses 4 discrete rectifier diode in a bridge configuration. I noticed two people gave C as the answer, a full wave rectifier can be made with 2 diodes but it uses a center tap transformer. And you didn't mention a transformer. The incoming AC can be full wave rectified with a bridge rectifier or 4 diodes arranged in a bridge configuration
2016-05-22 07:47:27 · answer #5 · answered by maribel 3 · 0⤊ 0⤋