3 The size of a proton is about 10^-15 m, so your de Broglie wavelength is a hundred billion times smaller than a proton.

4 The positron is the antimatter equivalent of an electron. It has the same mass as an electron, and the same amount of charge, but the charge is positive. Since there are two different types of beta particles, we often write them as β⁺ for the positron and β^- for the electron.

5 Tungsten: symbol “W.” Used in light bulb filaments.