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physicsanimations uploaded a new video
(3 months ago)
Ordinary sound waves propagate forward in the direction of source motion...
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Ordinary sound waves propagate forward in the direction of source motion, overtaking it, and back. Due to Doppler effect the still receiver located ahead a source detects a sound with the greater frequency, than emitted. If detector is behind of source, then the received frequency will be lower then emitted. In the first part of animation the rings show the surfaces of equal phase in the sound wave generated by a source. We see, that ahead of a source the density of such lines is more than behind of it. Because the speed of sound relatively the media is equal in all directions, the frequency of sound ahead a source and behind of it will be different.
Let's consider an object which moves with speed of sound (the plane, for example). At each moment of time it will radiate a circular sound wave. Because the speed of source coincides with speed of sound, emitted waves superpose each other and there is a jump of pressure (front of a shock wave) ahead of source as shown in second part of animation.
Next let's consider a case when the source of a sound moves with supersonic speed (in animation the source moves with double speed of sound). In this case sound waves can not overtake a source and for this reason there are no sound waves before a source, they appear only behind of it. Sound waves arising behind a source superpose with each other and form in space a conic surface of high pressure. This surface is a shock wave. It is easy to show, that a sine of the angle formed by front of a shock wave with a direction of movement of a source is equal to the ratio of speed of sound to speed of source (i.e. it is the reciprocal of Mach number).
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physicsanimations uploaded a new video
(3 months ago)
Oscillation of two balls bound with a spring. Acceleration of each ball ...
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Oscillation of two balls bound with a spring. Acceleration of each ball occurs in antiphase to displacement x, while velocity v is shifted by phase at 90 degrees.
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physicsanimations uploaded a new video
(3 months ago)
If the axis of easy magnetization coincides with direction of applied fi...
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If the axis of easy magnetization coincides with direction of applied field H, then magnetization occurs by means of domain walls motion. Thus, if the sample was magnetized to saturation, then reversal magnetization occurs sharply when magnetic field achieves anisotropy field Ha. The rectangular loop of a hysteresis is observed.
In a case when the axis of easy magnetization is perpendicular to the field H, magnetization occurs by rotation of domains. In this case the linear loop of a hysteresis is observed.
Magnetostriction. Animation shows a strip domain structure in a ribbon with an axis of easy magnetization perpendicular to the applied magnetic field H. Under the action of magnetic field the domains may rotate. This causes expansion of a sample.
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physicsanimations uploaded a new video
(3 months ago)
Two adjacent domains magnetized in opposite directions are always separ...
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Two adjacent domains magnetized in opposite directions are always separated by a transitive layer (Bloch Wall) in which there is a gradual turn of spins as shown in animation. Magnetization is accompanied with a movement of such Bloch Wall.
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physicsanimations uploaded a new video
(3 months ago)
Fiber optic atomic force microscope
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