[" (4) "8.82times10^(" th ")" electron in the second "],[" Bohr orbit of a hydrogen atom is "(a_(0)" is Bohr "],[" Bohr orbit of a hydrogen atom is "(a_(0)" is Bohr "],[" radius):- "],[[" (1) "(h^(2))/(4 pi ma_(0)^(2))," (2) "(h^(2))/(16 pi^(2)ma_(0)^(2))],[" (3) "(h^(2))/(32 pi^(2)ma_(0)^(2))," (4) "(h^(2))/(64 pi^(2)ma_(0)^(2))]]