Starship Asterisk*

You are correct, but one slit or two, the key requirement is the same - the slits have to be resolved. Whether you monitor one or both is irrelevant, but you need to resolve them. No, you don't. The slits could be infinitely narrow, for instance. You need only be able to detect the energy coming fr...

I think it is only necessary to observe one slit, that is enough to make the position of the photon certain (either it came through the slit we are watching, or it came through the other one). Once the position of the photon is certain, no interference pattern can be observed, only the diffraction ...

mark swain wrote: And then there was this:

http://iopscience.iop.org/1538-4357/636 ... 79.web.pdf

Sorry, no video. We have now found Blazars, maybe there are a few of these lurking out there too

AE

1. IF the lens is positioned to exactly image the slits on the screen (the sharp eye resolving the slits), then by optical theory, the intensity distribution of object plane is duplicated (with magnification) at the image plane (the viewing screen). Since there is no interference at the plane of th...

Experiment beats theory, ... True, but only if the experiment is done correctly (said as a general comment, no critique intended towards anyone) :) Regarding this puzzle question, I think a theoretical explanation is the intended response. No doubt I stand by the expanations I've stated - the funda...

Adding a "sharp eye" to the problem does change the result => no interference pattern is seen as long as the viewer stays focused! The "eye" is equivalent to using a lens and the same viewing screen. The most simple and definitive way for me to think about it is based in fundamen...

The paper and video is bogus and not close to consistent with GR. In fact, if "Physics 101" was all that's required (video) then GR is wrong. I say that because GR does not predict Allen's simple result. To think that a simple Newtonian integral over (all) time applies to a proven space-ti...

Lips like those you'll only find on the A-Train.
http://www-calipso.larc.nasa.gov/about/atrain.php

... But Danielsson, at least, is also a brane theorist, which means he is interested in what "caused" the Big Bang, and people who do work along those lines might describe scenarios a bit like what you initially described as occurring "before" the BB. So perhaps they were talkin...

In case you haven't seen this, the graphic the summarizes the presently most accepted, state-of-the-art understanding of the Big Bang model, and what is known including the new, Dark Energy component. You can see that quantum fluctuations started the ball rolling (if there is a ball), and therefore ...

... Given that position, laser pulses from Earth were successfully bounced off the old robot's reflector. Bouncing laser pulses off of this and other lunar reflectors could yield range data to the moon accurate enough to track millimeter-sized deviations in the Moon's orbit, effectively probing lun...

The Moon is covered with impact basins and lava flows created from impacts. Some highlands possibly not disturbed by impacts or eruptions are radiometrically dated as forming 4.4 billion year ago. So how do scientists propose its formation at 4.527 + or - 0.010 bya ? This is only one source, but it...

A further thought... if some mass is converted into energy ... (example; a fossil fuel burnt to provide heat, some of which is radiated and more is used to generate electricity, some of which is converted into radio waves, some of which is transmitted into space) ... is this lost from the mass of t...

The presence of the Sun will change the shortest path between Earth and the star, and light always takes the shortest path. I'd have to do some tough math to be certain, but I'm pretty sure that the presence of the sun (i.e. during the eclipse) makes the shortest path longer according to GR . You a...

As I got closer and closer to the black hole... what would happen to my Body Clock? You should probably get a firm grip on Special Relativity before you try General. Hello Beta - Certainly it is more helpful the more familiar you are with SR and GR, but Mark's question is relatively :!: easy to ans...

... What has always been amazing to me is that massless photons are affected by large masses (or something else producing effects we call gravity). One additional point: Space curvature is also affected by photons. Within GR framework, Energy is all that's required to affect space in which it exist...

By the numbers, this experiment is not trivial to do at home using visible light. Given the following setup: 1. Lambda = 0.633 microns (Red, Helium Neon laser) 2. a = Slit Width = 50 microns 3. d = Slit Separation = 0.65mm A divider screen, L ~ 75mm long is needed to block ~2/3 of the fringes across...

Where are you posting your correction to your previous subject derivation ? Thank you very much for this correction. I have posted the correction in original thread. "Off-Center Collision of Two Celestial Bodies" If I make any headway with a "simple" model to estimate a rotation...

.... 100% inelastic and no heat energy loss(!)- all tangential kinetic energy is converted to rotational energy. This statement is plum wrong, and I apologize for that stumble, and a big one at that! The correct statement is: For a 100% inelastic collision, ALL residual energy AFTER Momentum Conser...

The opaque divider placed AFTER, and in between the slits, prevents interference between the slits, i.e it is identical to blocking one slit or the other. A two-slit interference is simply the convolution of the single-slit diffraction pattern (assuming the same slit widths) and a uniformly spaced m...

Well, that's a golden oldie which was a spectacular picture at its time. Now, though, there are many images of the center of the Milky Way which are just so much better. As for this picture, I wonder what scale we are talking about. I think there are a couple of HII regions in the upper right of th...

Where has all the energy gone? In my collision scenario small portions of the energy go into heat, ejecta, increasing or decreasing the Earth's spin, and very possibly changing the axis tilt. Assuming most of the collision is elastic; and, an almost direct hit absorbed the largest portion of the im...

... A mass = 5% of the earth (~4.5x moon's mass) impacting the earth's equator at grazing incidence (30km/sec) has enough AM to stop the earth's rotation. This statement is wrong, there is a decimal point error. It should read: " A mass = 0.5% of the earth (~1/2 moon's mass) impacting the eart...

...I have a different hypothesis for explaining their existence. That is why I yearn for an equation or an explanation that gives the correlation between the mass of an impactor and the resulting amount of axis tilt of the body that was struck. I need to know the relative amounts of large energy lo...

Fog bows are closely akin to rainbows NOT GLORIES (and certainly NOT gegenschein). Fogbows are similar to rainbows- both phenomena primarily associated with internal reflections in water droplets. Glories and gegenschein are similar, as both are primarily associated with scattering. Also, for all p...