In 1906, J.J. Thompson was awarded the Nobel prize for discovering a very important particle - the electron. It is ironical that in 1937 his son, J.P. Thompson, would be awarded the Nobel prize for proving that the electron was actually a wave.
We will begin our exploration of quantum mechanics with this wave nature of the electron. Is everything a wave? If so, what determines the wavelength of such waves?
Further, we need to ask about the consequences of something being a wave. In what way do waves behave differently from particles? Are there any important effects in our everyday life that result from the wave nature of the electron?