The wave mechanical model of atom is based upon

If uncertainty in the position of an electron is zero,the uncertainty in its momentum would be

$x$ and $y$ are two moving particles. The uncertainty in the momentum of $x$ is half the uncertainty in the momentum of $y$. If the uncertainty in the position of particle $x$ is $0.05 \ \mathring{A}$,then the uncertainty in the position of particle $y$ is = .......

The uncertainty in momentum of an electron is $1 \times 10^{-5} \ kg \ m/s$. The uncertainty in its position will be $(h = 6.63 \times 10^{-34} \ Js)$.

Uncertainty in position of a $0.25 \ g$ particle is $10^{-5} \ m$. What is the uncertainty in its velocity? (Given: $h = 6.6 \times 10^{-34} \ J \ s$)

State the Heisenberg uncertainty principle.