Question

If the electron is to be located within 5 * 10^-5 Å, what will be the uncertainty in it's velocity ?

Answer 1

\[\Delta x.\Delta p \ge h \div 2\]

This is the Heisenberg's Uncertainity principle..

Answer 2

\[\Delta x . m \Delta v \ge h \div 2\]

m = Mass of electron
Delta x = uncertainty in Position and Delta v is the uncertainty in velocity.