Step 1 | Step 2 | Step 3 | The twist |
The twist
When an observer or measuring device(Motion 2) is placed at the exit of the slit, the electrons react to the device. As if the electrons somehow know that they are being watched! When being 'observed' the electrons now behave differently and act like how we first expected them to and form two bands behind the screen(Screen 5). It acts like a particle whereas before it acted like a wave, when now it was merely being observed! The act of observing caused the electron to behave different! This is the eeriness of the quantum subatomic world. This is what has baffled the greatest minds for centuries. So: Is matter made up of particles or waves, or maybe both? That is the question. You decide.
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Motion 2 |
Screen 5(click to enlarge) |
Parts |1 | 2 | 3 |

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