Velocity of the electron in the` 1^(st)` Bohr orbit of H-atom is

Options

A. `2.18xx10^8 ` cm/sec
B. `2.18 xx 10^8 ` m/sec
C. `2.18 xx 10^(16)` cm/sec
D. `36559 xx 10^8` cm/sec

Answer

A

Explanation

`v= z/n (2.18 xx 10^8 cm//s) , n=1 `