# Alternate double slit experiment explanation.

**URL:** https://boards.straightdope.com/t/alternate-double-slit-experiment-explanation/836938
**Category:** Factual Questions
**Created:** [July 12, 2019, 12:00am UTC](https://boards.straightdope.com/t/alternate-double-slit-experiment-explanation/836938 "2019-07-12T00:00:13Z")
**Posts on this page:** 1
**Page:** 2

<div class="post-metadata">

### Author: ![CurtC](https://avatars.discourse-cdn.com/v4/letter/c/ce73a5/32.png) [@CurtC](https://boards.straightdope.com/u/CurtC)
#### Post date: [July 19, 2019, 2:16pm UTC](https://boards.straightdope.com/t/alternate-double-slit-experiment-explanation/836938/21 "2019-07-19T14:16:44Z")

</div>

> [@Kedikat](#):
>
> Really? That is a great tidbit of information I have not come across. But I think that reinforces that it is not a wave effect. How can yesterdays photon, determine todays photon behavior, so it appears as if it is interfering or reinforcing in a wave like manner?

It’s not yesterday’s photon doing the interfering - it’s the wave of today’s photon going through both slits.

[Previous page](https://boards.straightdope.com/t/alternate-double-slit-experiment-explanation/836938.md?page=1)