Question
The mass of a proton is $1.67\times 10^{-27}\textrm{ kg}$. If a proton has the same momentum as a photon with a wavelength of 325 nm, what is its speed?
1. $2.73\times 10^{-3}\textrm{ m/s}$
2. $0.819\textrm{ m/s}$
3. $1.22 \textrm{ m/s}$
4. $2.71\times 10^{4}\textrm{ m/s}$
(c)
Solution Video