Posted by **Jacob** on Wednesday, November 7, 2007 at 3:49pm.

What would be the uncertainty in velocity (miles/hr) of a neutron beam particle if the position can be measured within +/- 25 angstroms.

The rest mass of a neutron = 1.67493 X 10^-27 kg or 1.008664904(14) amu.

I know you have to use the heisenberg uncertainty principle: (deltaX)(delta mv) > (or equal to) planck's constant/4pi.

So far I have (+/- 25 A)(1.67493XX 10^-27 kg) > 5.21X10^-34

what do i do now?

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