The energy of an electron in the third Bohr orbit of singly-ionised helium (He ) is…

CHEMISTRY · Single correct · CBSE · Chemistry · Structure of Atom · Structure of Atom

Problem

The energy of an electron in the third Bohr orbit of singly-ionised helium (He

^+

) is measured to be

-6.04\,\text{eV}

. Using this information, determine the speed of the electron in its first Bohr orbit. Choose the closest value. (a)

2.19\times10^{6}\,\text{m\,s}^{-1}

(b)

1.46\times10^{6}\,\text{m\,s}^{-1}

(c)

4.38\times10^{6}\,\text{m\,s}^{-1}

(d)

8.76\times10^{6}\,\text{m\,s}^{-1}