Heisenberg's uncertainty principle is

\Delta x \Delta p \geq \frac{h}{4 \pi}

\Delta x= uncertainty in position

\Delta p= uncertainty of momentum

{h}= Planck's constant= 6.626176 x 10^-34


which states that if you know electron's position then you can't find its momentum(hence velocity) and vice versa.

it is applicable only for microscopic particles.


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