An electron is located with an uncertainity equal to its uncertainity in its momentum. What will be its uncertainity in velocity (symbols have usual meaning)

Options

A. `sqrt(h/(4pi))`
B. `h/(4pi)`
C. `1/(2m) sqrt(h/(pi))`
D. not possible

Answer

4

Explanation

`DeltaP^(2)=sqrt(h/(4pi))`
`m Deltav=sqrt(h/(4pi)) rArr Deltav=1/(2m)sqrt(h/(pi))`
`DeltaV=7.9 xx10^(12)` m /sec. which is greater than C (speed of light)