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## Homework Statement

On which orbit of hydrogen atom an electron has the speed of [itex]734 km/s[/itex]?

## Homework Equations

Bohr's second postulate: [itex]mvr=nh,m=9.109\cdot 10^{-31}kg,v=734 km/s,h=6.626\cdot 10^{-34} m^{2}kg/s[/itex]

## The Attempt at a Solution

By using the second Bohr's postulate, we get [tex]6686.006\cdot 10^{-28}r=6.626\cdot 10^{-34}n[/tex]

**Question:**What is the value of radius of orbit of electron, [itex]r[/itex]?

If we set that [itex]r=0.0529 nm[/itex], then we get [itex]n=0.053[/itex] and [itex]n[/itex] should be positive integer.