## Chemistry and Chemical Reactivity (9th Edition)

From De Broglie's equation: $\lambda=\frac h{m.v}$ $\lambda=6.626\times20^{-34}\ J.s\times 1\ (kg.m^2/s^2)/J\div (0.046\ kg\times 30\ m/s)$ $\lambda=4.80\times 10^{-34}\ m=4.80\times 10^{-25}\ nm$ For the given wavelength: $v=6.626\times20^{-34}\ J.s\times 1\ (kg.m^2/s^2)/J\div (0.046\ kg\times 5.6\times10^{-12}\ m)$ $v=2.57\times10^{-21}\ m/s$