To eject an electron out of an atom, a packet of light hitting the electron must have enough energy to detach it from the atom.
If the light is made up of packets with less energy than required, doesn't matter how many packets are thrown at the electron (however much or for however long), the light would never be able to cause the electron to escape the metal surface.
all matter (from massive objects to as small as electrons) could also behave as waves and even gave a mathematical equation for the wavelength of such a wave.Experiments conducted later in 1927, showed that -
You can visualise this probability wave as given below.
- We need to give up our assumption, that each individual electron fired towards the slits is a particle throughout its journey to the screen.
- When we are not looking at or observing the electron, it behaves like a wave. The moment we observe the electron (say by putting a screen), the wave collapses into a particle.
- This wave can be thought of as a wave of probabilities. The probability of the electron being at a certain position. In fact, it applies not only to 'position' but also to other properties of the electron like 'velocity (speed with direction)', 'spin' etc.
- When we observe the electron, its probability wave collapses and takes up a definite location from among the various possible locations. Similarly, it takes up a definite value for its other properties like spin, momentum, etc; from a range of possible values.
But in the case of entangled particles, the collapsing effect is transmitted to the other end faster than even light - instantaneously. This is the EPR Paradox.