Question

. If the kinetic energy of an electron in the ground state hydrogen atom is 2.2 x 10-18 J,
calculate its momentum. (2 marks)

Answer 1

momentum is given by $\frac{h}{\sqrt{2mK }}$

p=$\frac{6.63\times10^{-34}} {\sqrt{2\times9.1\times10^{-38}\times2.2\times10^{-18}}}=\frac{6.63\times10^{-6}}{6.32}=1.05\times10^{-6}$