Question
A proton is confined in an atomic nucleus of size 2 fm. Determine the fundamental limit on
the uncertainty of any prediction for the measurement of the momentum of the proton in the
nucleus.
the uncertainty of any prediction for the measurement of the momentum of the proton in the
nucleus.
Answers
The uncertainty in proton location is
deltax = +/- 1 fm = 10^-15 m
The uncertainty in x-momentum is
deltaPx = (h/4pi)/deltax = 5*10^-20 kg m/s
where h is Planck's constant.
Your book may eliminate the 1/(4 pi) factor. It depends upon how the uncertainty is defined. The h/4 pi value is the product of standard deviations.
Remember that there are uncertainties in three directions of momentum. The total momentum uncertainty is a factor of sqrt3 higher.
I would not be surprised if your book's answer is up to a factor of ten different.
No wonder they call it the uncertainty principle. :-)
deltax = +/- 1 fm = 10^-15 m
The uncertainty in x-momentum is
deltaPx = (h/4pi)/deltax = 5*10^-20 kg m/s
where h is Planck's constant.
Your book may eliminate the 1/(4 pi) factor. It depends upon how the uncertainty is defined. The h/4 pi value is the product of standard deviations.
Remember that there are uncertainties in three directions of momentum. The total momentum uncertainty is a factor of sqrt3 higher.
I would not be surprised if your book's answer is up to a factor of ten different.
No wonder they call it the uncertainty principle. :-)
I don't understand why you've used 4 pi in your answer, i assume your rearranged the uncertainty principle equation for delta Px, but isnt the reduced plancks constant h/ 2pi instead of 4pi ?
Related Questions
On which atomic property proposed by Henry Moseley is the current periodic table of the elements bas...
On which atomic property proposed by Henry Moseley is the current periodic table of the elements bas...
On which atomic property proposed by Henry Moseley is the current periodic table of the elements bas...
On which atomic property proposed by Henry Moseley is the current periodic table of the elements bas...