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This is a simple application of Heisenberg’s uncertainty principle, which is as follows:

$ΔxΔp≥4πh $

where $Δx$ is the uncertainty in position, and $Δp$ is the uncertainty in momentum and $h$ is the planks constant.

Now, the uncertainty in a position here is simply the region where your electron is confined.

Here it is $10_{−10}$

Therefore,

$Δp≥$$4πΔxh $

$Δp≥4π×10_{−10}6.62607004×10_{−34} $

Which means your Uncertainty in Momentum is approximately,

Therefore ;

$5.27286×10_{−25}kgms_{−1}$

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