a) Using the Bohr's model calculate the speed of the electron in a hydrogen atom in the n = 1, 2 and 3 levels.

Explanation

From `v=(c )/(n) alpha," where "alpha=(2pi Ke^(2))/(ch)=0.0073`
`v_(1)=(3xx10^(8))/(1)xx0.0073=2.19xx10^(6) m//s`
`v_(2)=(3xx10^(8))/(2)xx0.0073=1.095xx10^(6) m//s`
`v_(3)=(3xx10^(8))/(3)xx0.0073=7.3xx10^(5)m//s`