Frequency of Matter

There's nothing magic going on. The camera shutter has to be open for a small amount of time to capture light. The propeller moves during that time and appears blurred. Every light sensor, your eye included, requires some amount of time to capture enough light to detect, so that something moving fast appears to be in more than one place.

It does nothing to do with the bandwidth of light 430~790THz right?

Let us say RPM approach 790THz, it is still visible so long as light still could reflect on the surface and a powerful high speed camera is available for that.

But say RPM > 790THz, what will happen?

790 thz would be 47400000000000000 rpm.....

Awesome photo!

Solar, that amazing image could lead to a discussion of the pattern the droplets are taking.

OK here's a video....playing with bubbles....

https://www.youtube.com/watch?v=blNe2Ae5a2c

Thanks for the video, notice the rate of disintegration for the bb bubble catches up with the bb at the exit point. Is this a constant?

that has to be an artifact coincidence. If the BB was much faster, it would outrun the bubble collapse, and if way slow, then the bubble would collapse would be the faster.

I suspect it depends on the speed of sound (as in a shock wave) in water, rather soapy water. Not that I want to do the calculations to attempt to prove this. Surface tension is a force on the surface of the bubble, that is uniformly compressing the air inside the bubble so that pressure and surface tension come to dynamic equilibrium.

The projectile impact disrupts the surface, and the surface tension accelerates the collapse of the surface into itself (around the periphery of the quasi-spherical bubble), essentially unimpeded by surrounding air to the extent that the bubble surface film of liquid is in a two-dimensional space (at least locally). The speed limit is what? Is it the speed of sound in this specific liquid? The acceleration is complicated by the fact that the mass being accelerated by surface tension also increases with time, and droplets are forming that partially removes some of this energy?

Hmmm...seems like a bubble inside a bubble with a woman in it.

The inability of your eyes capture and your mind to process all the data necessary for a clear image at lower rpm. As rpm increases faster the eye captures an image perceiving the blade to be in all positions at once. At some point the blade will spin fast enough that the reflected light will be captured as a solid.

It will never reach a speed that makes it appear as a solid unless you mean a neutral density attenuator with a dim ghost like translucent circular pattern. The propeller cap will look like a solid, because it is.

Your right not a solid say more defined.

You can actually control the "wagon wheel effect" by humming...as you hum it vibrates the eye, you can vary the pitch becoming sympathetic at times to the rotational frequency causing backward and forward motion illusion....but it's all in the mind....

http://en.wikipedia.org/wiki/Wagon-wheel_effect

What amazes me, is the perception of depth produced by stereoscopic vision, the perception of location produced by stereo auditory reception and the amount of time involved in the phase shift.

The transparency of the propeller is only partially due to its speed. If it's turning very slowly, you'll see it fairly well, but once it gets above a certain speed it's visibility no longer changes. The area of the blades occupies a fixed portion of the area of the circle described by the tips of the blades, so even though it goes faster, the ratio of the areas doesn't change, so the net transparency doesn't change just because it's going faster.

What CAN make the transparency change is the visual contrast between the blades and the background scenery. The higher the visual contrast, the more visible the blades will be. The contrast is due to 1. the brightness of the scenery behind it, and 2. the brightness of the reflection off the prop blades. If the scenery is dark and there is a light shining on the blades, they (the blur) will be very visible - and the blur will be less visible if the lighting is reversed.

An extreme example of this is a propeller illuminated by a strobe light. If the flashing of the strobe is synched to the rotation of the blades, the blades can be made to appear standing still.

This is a great thread with all good answers so far and I have nothing to add except that I concur with the above and I gave SolarEagle a GA for the great photo.

I have never seen a bubble burst like that before and I did not even know that until I seen the photo.

A moment of discovery, seen something I never thought about before...it has been a while since that has happened.

Thanks.

You appear to be confusing many concepts, persistence of vision, camera shutter speed etc with some properties of light and mass that are irrelevant in this question.

For a meaningful answer, you need to first formulate a simple concise question based on a defined set of circumstances.

Del

Yes Del, don't expect too much with a scratch. It's not quite organized thoughts as of the moment. Sort of bumping my head on the pavement and still a little dizzy and confused abit, anyhow i got lots of time to resolve the idea. Thanks everyone for the inputs. I appreciate it.

Picture you have posted tells enough about what other have commented. You can see stroboscopic effect clearly.

Are you referring to the propeller theory of matter, that has to do with how events are perceived at the event horizon of a black hole?

This may have more to do with radiative evaporation of a gravitational well than high speed photography.

In this universe, matter and energy are sometimes subjected to extremes that supercede what we commonly experience, and it is quite hard to come up with a general solution for all observed behaviors.