electric box fan
2006-10-08 11:45:48 · 6 answers · asked by stacypeacock1967 3 in Health ➔ Other - Health
The answer is that you hit your Nyquest limit.
OK, its kind complicated. Your brain can only proccess so many signals per second. The info from your eye is sent in pulse. When objects spin they can reach a speed where the pulses your eyes are sending to your brain is off. Ever notice how wheels on cars suddenly look like they're going backwards when they get too fast. Your brain doesn't proccess the info correctly because the way your eyes are pulsing the info to it.
Your TV is set up to pulse the video image at you at the same rate your eyes normal proccess. (your tv flashes a series of static pictures, there's no real movement) When you put a spinning object in front of a pulsing object weird things happen because of the sampling frame rate of your eyes.
2006-10-08 11:53:59 · answer #1 · answered by Anonymous · 0⤊ 0⤋
There is more contrast between the TV light and darkness that is caused by the fan. If the area in front of the blade and back of the blade is the birghtness, you wont see the differences well enough.
2006-10-08 18:48:36 · answer #2 · answered by leikevy 5 · 0⤊ 0⤋
It's because the tv is "drawing" each frame on the screen. So it catches the fan blades at different positions.
2006-10-08 18:48:43 · answer #3 · answered by morningstar 3 · 1⤊ 0⤋
Because the tv screen images "refreshes" about 24 times a second. It is called vertical scan rate. It acts sort f like a strobe light which "freezes" the action of moving items like a fan.
2006-10-08 18:48:35 · answer #4 · answered by missourim43 6 · 2⤊ 0⤋
because with the way the light is on the tv............it seems as if you can see each blade in turn!!!!!
2006-10-08 18:48:35 · answer #5 · answered by LOL 2 · 0⤊ 0⤋
Stroboscopic effect
2006-10-08 18:49:20 · answer #6 · answered by theodore r 3 · 0⤊ 0⤋