Question
The least massive particle known to exist is the electron neutrino. Though scientists once believed that it had no mass, like the photon, they have now determined that this particle has an extremely low mass, equivalent to a few electron volts. Assuming a mass of $2.2 \textrm{ eV/c}^2$ (or $3.9\times 10^{-36}\textrm{ kg}$) and a speed of $4.4\times 10^{6}\textrm{ m/s}$, which of the following values equals the neutrino’s de Broglie wavelength?
1. $3.8\times 10^{-5}\textrm{ m}$
2. $4.7\times 10^{-7}\textrm{ m}$
3. $1.7\times 10^{-10}\textrm{ m}$
4. $8.9\times 10^{-14}\textrm{ m}$
(a)
Solution Video