The diffraction pattern will be either constantly scaled up or down.with time.greswd said:
blue_leaf77 said:
do you know of any diagram that illustrates this?sophiecentaur said:
I wouldn't think there would be an explicit description of it anywhere - not like you are asking for. But start with the basic two slit setup and the theory. Moving forward and backwards is just altering the position of the position where the central constructive interference peak will occur and the lateral separation of the slits will give fringes according to the separation. I assume that you already have the basic diagram and theory available to you. Else look in the Hyperphysics pages. Using that information, it is easy to draw a diagram for yourself by superimposing two diagrams onto each other to show the positions of the fringe maxes.greswd said:
The intensity pattern formed by a double slit interference is ##I(x) \propto \cos^2\left(\frac{\pi d x}{\lambda L}\right) ## for the case of ##x## in the vicinity of the central maximum, so when the screen (or the slit plane) is moving backwards or forward, ##L## is varying, and hence in such a case, won't the whole fringe structure be beating between getting bigger (fringes separation increases when ##L## increases) and getting smaller (fringes separation decreases when ##L## decreases) with the central maximum remains at its place?sophiecentaur said:
Having demonstrated a ripple tank many times, I can tell you that the surface of the water looks just a confusing mess that students (and I) find very hard to interpret. What you actually see is a mass of little diamond shaped peaks and troughs moving from left to right and expanding. The simulation above shows this (once you've sussed out the colour key they use). If you freeze the animation (which you can't do with the water tank) you may see what I mean. Actually, you can sometimes use a strobe to freeze the pattern - but don't rely on it!greswd said:
greswd said:
Are you looking for some frequency changes where the waves hit the moving edges? As far as I can see, the doppler effect on the waves hitting the edge will be canceled as they leave and the resulting wave wouldn't have a different frequency (well it couldn't, could it?). The wavelets through the middle wouldn't be affected, of course but the path differences would be the same at any instant. (see above comments too). There is the added factor of the 'bow wave' as the slot moves through the water but the waves forming the interference pattern would just sit on top of that.greswd said:
I can't see why. The edge of the slit would be moving away from the incident waves and towards the forward propagated waves. (No?)greswd said:
Diffraction of light with moving slit is the phenomenon where light waves passing through a slit that is in motion will produce a diffraction pattern on a screen or surface.
The motion of the slit affects the diffraction pattern by changing the width of the slit and thus altering the interference of the light waves passing through it. This results in a shift or distortion of the diffraction pattern.
The factors that influence the diffraction of light with moving slit include the width and speed of the slit, the wavelength of the light, and the distance between the slit and the screen.
The main difference between diffraction of light with a stationary slit and a moving slit is that the motion of the slit adds an additional variable to the diffraction process. This results in a more complex diffraction pattern with multiple peaks and valleys.
Studying diffraction of light with moving slit has practical applications in fields such as optics, telecommunications, and astronomy. It helps in understanding the behavior of light waves and can be used to analyze and manipulate light for various purposes.