To make the interference purely destructive everywhere, the initial interfering beams would have to have highly synchronized phases pretty much at every place of the photographic plate (or strictly). But that's only possible if the beams are coming from nearly the same direction.

2019年4月9日 · The energy lost in destructive interference are photons that have returned to their source. It is worth watching to get an intuition about light, and the comments are enlightening ;) too . Interference of light is not interaction of photons, but a pattern in the quantum mechanical (probabilities) superposition of the zillions of photons that ...

Then there is destructive interference in some areas ("nodes") and constructive interference in others ("hot spots"). The energy has been redistributed but the total amount of energy is the same. The bottom is an example where the two sources S3 and S4 are highly directional plane-wave emitters, so that they can destructively interfere ...

2020年11月9日 · This video from MIT open courses helps in understanding the complexity of interference patterns from two beams : Optics: Destructive interference - Where does the light go?. It experimentally shows that the light from the dark fringes goes back to the source of the collimated beams. So overall energy is conserved.

2019年2月22日 · Another misconception is that a photon is a particle. It is emitted and absorbed as a particle, but it flies as a wave. When you split a beam into two by mirrors or slits, you split each photon into two trajectories at the same time. A destructive interference is not about two photons interfering. This would be a violation of energy conservation.

2017年11月23日 · Whenever you have destructive interference somewhere, you always produce constructive interference somewhere else. The reason is that all processes are unitary. Therefore, the device or setup that you use to produce the destructive interference can be modeled as a four port system with two input ports and two output ports.

2019年6月10日 · Destructive interference happens when the crests of one wave align with the troughs of another wave, the amplitude of the resulting wave will then be the absolute difference of the amplitudes of the source waves. Over the span of every wavelength there is one crest and one trough, separated by half a wavelength.

Musical instruments absolutely can and do cause destructive interference. It happens all the time. Usually, it's only noticeable if the two notes are in tune within a few Hertz, or even a few decihertz. This causes the audience to hear the interference as "beats", where the magnitude of the sound goes up and down at a noticeable frequency.

In your convention, it's guaranteed that the total energy at the end is always "in between" the energy from the constructive interference and the energy from the destructive one, which is simply the average $$ (4 A^2 + 0 ) / 2 = 2A^2,$$ exactly as the original energy.

2022年12月26日 · Points of destructive interference will be highly localized, especially in the case of ultrasonic sound. In order for near complete destructive interference to occur: everything has to line up just right. The two propagating sounds must be perfectly out of phase, and they must be of the same amplitude (the same loudness).