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### Indeterminacy of Momentum

Posted: Thu Apr 26, 2018 11:16 am
For the example of Heisenberg we did in class, we found the indeterminacy of momentum, but then we went on to find the indeterminacy of velocity. I was just wondering why we did that extra step, why didn't we just stop with indeterminacy of momentum?

### Re: Indeterminacy of Momentum

Posted: Thu Apr 26, 2018 11:18 am
I think that you will always have to calculate the indeterminacy in velocity using delta p = (mass) x (delta v). Momentum includes both mass and velocity in the value, so it is difficult to infer anything useful from just the indeterminacy in momentum. This is why we took the extra step and found the indeterminacy of velocity, because only at that point can you determine whether or not the value you calculate is realistic.

### Re: Indeterminacy of Momentum

Posted: Sun Apr 29, 2018 9:43 pm
I agree, we don't really have a number to which we can compare the uncertainty of momentum to see if it's realistic, but it's easy to compare the uncertainty of velocity to the speed of light to see if it is realistic.

Anna De Schutter - section 1A