Dual Universe: Eternity | Spacetime

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18 Twin-Slit Wave Interference

In this experiment, the screen used previously is modified by adding a second tiny hole in the screen about 2 mm away from the first. To allow a clearer demonstration of the effect, the twin holes are stretched out into two parallel slits.

Again, at very low intensities of the monochromatic light, individual photons causing flashes on the display arrive at random times and positions (angles of flight). However, with the passage of time, each slit does not produce the smooth normal distribution seen with a single hole or slit. We would expect two such distributions to appear (one from each slit) and combine into a single smooth distribution. We would also expect a dip in the middle due to the slight separation of the two individual distributions. Instead we see a stationary wave pattern.

This wave pattern resembles that caused when two traveling waves of the same wavelength, in a medium like water, collide and produce a pattern of stationary waves (in a harbor with two entrances, for example). Moving crests of two incoming waves continually meet at the same location. There, they combine, and form the peak of stationary wave.  Where troughs meet, they combine to form the trough of a stationary wave. In between, there is a smooth transition between peaks and troughs. The kinetic energy of the moving waves has been transformed into a stationary wave of potential energy.

Updated 3/25/2017

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