Question

what is the velocity of present?
(a)20km/hr
(b)10km/hr
(c)15km/hr
(d)25km/hr

Answer 1

Answer:

2.18×106m/s

The velocity of electron  of the nth stationary state for a hydrogen-like specie is expressed as :

vn=2.18×106×nZm/s

where Z=atomic number and n= orbit.

For First Bohr orbit of Hydrogen atom, n=1 and Z=1

thus for Hydrogen v1(H)=2.18×106×11 m/s

or the velocity of electron present in first Bohr orbit of hydrogen atom=v1(H)=2.18×106 m/s

I hope it will help you