1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Help Uncertainity principle problem

  1. Nov 27, 2007 #1
    in my problem i am told
    that the x-component of the velocity of a 2x10^-4 kg mass is measured to an accuracy of +_ 10^-6 m/s.
    i need to find the limit of the accuracy with which the particle can be located along the x-axis.

    the uncertainity principle
    delta(x) * delta(Px)>= h/4pi
    i have delta(Vx) and i need delta(x)
    help please
  2. jcsd
  3. Nov 27, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    this is not homework sub-forum, here we post general questions about QM.

    someone will move this thread to the right sub-forum, just so know in the future.

    Also you need to show some work before you get help.

    but I can give you a hint: calculate the deltaP, you have mass and deltaV, it is straightforward.
  4. Sep 27, 2009 #3
    If black holes are described as having no volume of space, yet they are 'mass" via density.
    Mass density= MASS per VOLUME of SPACE.
    So, density = mass per volume, & in order to MEASURE the density of something is to measure its MASS, then measure its VOLUME then divide MASS/VOLUME.

    Why does there seem to be a contradiction?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook