## Unicorn Practice Midterm #8

$\Delta p \Delta x\geq \frac{h}{4\pi }$

Andrea Raymundo 1B
Posts: 32
Joined: Wed Nov 15, 2017 3:04 am

### Unicorn Practice Midterm #8

A bullet of mass 2.8 g travels at 373.23 ± .34 m/s. What is the indeterminacy of position?

could anyone help on where to start on this

Kuldeep Gill 1H
Posts: 44
Joined: Fri Apr 06, 2018 11:02 am
Been upvoted: 1 time

### Re: Unicorn Practice Midterm #8

Hi so since the velocity can be + or - .34 we would multiply it by two since that is the amount we can go in two directions this then becomes the uncertainty in velocity. Then you can convert the g into kg and plug into the equation delta-p = mass* delta-v then plug in delta-v and mass into the equation... this will give you the uncertainty in momentum which is delta p then you can plug in the value of delta-p into the equation delta-p * delta-x= h/4pi then solve for delta x which will give you the uncertainty in position... hope that helps!

Sarah Brecher 1I
Posts: 31
Joined: Fri Apr 06, 2018 11:02 am

### Re: Unicorn Practice Midterm #8

If the question was asking "can you blame the Heisenberg Uncertainty Principle?" what would the answer be? Yes or no?

I know that if the uncertainty is really small then you can't blame the uncertainty principle but how small is too small?

ErinKim1I
Posts: 31
Joined: Fri Apr 06, 2018 11:03 am

### Re: Unicorn Practice Midterm #8

I keep getting 10^-31 instead of 10^-32, can someone help me figure out where I went wrong?

I converted the g to kg and made sure I used the right units..