Figure 3. I propose an experiment to determine whether an electron (once it is detected) turns into a particle only or into a new wave source. In images A and B, an electron wave passes through a double slit and is detected with a photon. Also, the electron wave is detected close enough to the first barrier that it causes the wave to collapse so that it could only have passed through one slit—not both. In image A, the detected electron becomes a new wave source, and it is able to pass through both slits in the second barrier. Hence, on the other side of this second barrier, an interference pattern is created, as shown in image A. On the other hand, in image B, no new wave source is created. Instead, the electron collapses to a particle only. And, this particle can only pass through one hole located in the second barrier. As a result, no interference pattern exists behind the second barrier. Image A is the only possibility for the wave source interpretation of quantum mechanics, whereas image B is a real possible outcome for the Copenhagen interpretation of quantum mechanics, unless the particle becomes a wave again fast enough to be able to pass through both slits. However, this is unlikely the case if the wave collapses to only a particle. Although there is no interference pattern in Figure 3B, different particles still pass through either slit, creating two areas of high density on the final screen. Figure 3A has an interference pattern on its final screen. The dark areas on the final screen are where the electron hits the screen.