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How is a wave changed by reflection?
When a wave traversing in a medium of less refractive index gets reflected at a medium of greater refractive index then wave undergoes a phase change of pi radians. But if the same reflection takes place as the wave traverses from a medium of greater refractive index to that of less refractive index, then no such phase change. The later reflection is known as total internal reflection. So as light traversing in air gets reflected at glass then phase change of pi radians occurs.
Reflection from a hard boundary produces what?
a 180 degree phase shift of the incident wave in the reflected wave.
What happens when a wave bounces back after it hits a boundary?
that depends on the boundary if it is a fixed or hard boundary, there is zero displacement and the reflected wave changes its polarity , i.e. it undergoes 180 deg phase change if it is a flexible or soft boundary, the restoring force is zero and the reflected wave has the same polarity in other words there is no change in phase
What is a reflection of a sound wave?
A reflection of a sound wave occurs when the wave encounters a boundary and some of the wave energy is sent back in the opposite direction. This can happen when the wave encounters a solid surface, such as a wall, or a change in the medium through which the wave is traveling. The reflected wave will have the same frequency as the original wave, but its amplitude and phase may be altered.
What happens when a solid barrier when the waves reach the barrier?
When waves encounter a solid barrier, they are reflected back in the opposite direction, causing interference with the incident waves. This reflection can result in amplification or cancellation of the wave amplitude depending on the phase relationship between the incident and reflected waves.
How is a wave changed by reflection?
When a wave traversing in a medium of less refractive index gets reflected at a medium of greater refractive index then wave undergoes a phase change of pi radians. But if the same reflection takes place as the wave traverses from a medium of greater refractive index to that of less refractive index, then no such phase change. The later reflection is known as total internal reflection. So as light traversing in air gets reflected at glass then phase change of pi radians occurs.
Why waves travelling on string always invert upon reflection?
Because the reflection is off of a point where the string is not allowed to move. You can determine the phase of a reflected wave relative to the incoming wave from the freedom of motion of the point of reflection. Since the point of reflection in the case of a string is not allowed to move, we can imagine that if it was a point on a longer string (and thus free to move) what would be the required phase of a wave coming from the distance moving in the direction of the reflected wave that does not move that point. Thus the reflected wave must always cancel the incoming wave at the point of reflection, the only phase that will fulfill this condition is the inversion (180 degree phase shift).
Reflection from a hard boundary produces what?
a 180 degree phase shift of the incident wave in the reflected wave.
What happens when a wave bounces back after it hits a boundary?
that depends on the boundary if it is a fixed or hard boundary, there is zero displacement and the reflected wave changes its polarity , i.e. it undergoes 180 deg phase change if it is a flexible or soft boundary, the restoring force is zero and the reflected wave has the same polarity in other words there is no change in phase
What is a reflection of a sound wave?
A reflection of a sound wave occurs when the wave encounters a boundary and some of the wave energy is sent back in the opposite direction. This can happen when the wave encounters a solid surface, such as a wall, or a change in the medium through which the wave is traveling. The reflected wave will have the same frequency as the original wave, but its amplitude and phase may be altered.
Why an exssecively thin film appears black in the reflection of light?
Destructive interference. If the sheet is very thin, near half the wavelength of the incident light then light reflected from the top layer is out of phase with light reflected from the bottom layer. These two reflected light waves will cancel each other out.
Do you get a phase change of pi on reflection with denser medium in case of longitudinal waves?
This is a general property of waves. If you have waves reflecting off a clamped point (like waves running on a string that you pinch hard at one point), the waves get phase inverted. The reason is the principle of superposition and the condition that the amplitude at the clamped point is zero. The sum of the reflected and transmitted wave must be the amplitude of oscillation at all points, so that the reflected wave must be phase inverted to cancel the incoming wave. This property is continuous with the behavior of waves going from a less massive string to a more massive string. The reflection in this case has opposite phase, because the more massive string doesn't respond as quickly to the tension force, and the amplitude of oscillation at the contact point is less than the amplitude of the incoming wave. This means (by superposition) that the reflected wave must cancel part of the incoming wave, and it is phase reflected. When a wave goes from a more massive string to a less massive string, the less massive string responds with less force, so that the derivative at the oscillating end is flatter than it should be. This means that the reflected wave is reflected in phase with the incoming wave, so that the spatial derivative of the wave is cancelled, not the amplitude reduced. In optical materials of high density are analogous to strings with a higher density, hence the name. If you go into a material with low speed of light, the time derivative term in the wave-equation is suppressed, so that the field responds more sluggishly, the same way that a massive material responds more sluggishly to tension pulls. Since the eletric field response in these materials is reduced, the reflected wave is phase inverted to make the sum on the surface less, as is appropriate to match with the transmitted wave.
What happens when a solid barrier when the waves reach the barrier?
When waves encounter a solid barrier, they are reflected back in the opposite direction, causing interference with the incident waves. This reflection can result in amplification or cancellation of the wave amplitude depending on the phase relationship between the incident and reflected waves.
What determines the direction of energy transfer in a phase change?
light is form of energy then light is reflected at boundary of rarer medium and denser medium reflected ray is phase change of 180 degree's energy is phase changed direction of energy is opposite of transfer ed way
Why phase change of 180 takes place when wave enter from rarer medium to denser medium?
The displacement is a peculiar state, due to the fact that this is one of the special situations in which energy is completely destroyed and conservation of energy does not take place; hence the phase change
How do wave refraction and diffraction and reflection affect the behavior of waves?
Waves can and do meet boundaries in their medium. When a wave meets a boundary, it can be reflected or transmitted. Reflection can be partial or complete. Reflection can also involve a phase flip
What happens to the temperatures of a substance while it is changing state?
It can lose or gain energy or it forms the attractions between particles.
