Solving with Heisenberg

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

rachelle1K
Posts: 86
Joined: Sat Sep 07, 2019 12:16 am

Solving with Heisenberg

Why do we sometimes multiply $\Delta v$ by an integer?

For example, in the Dino nuggets problem, it states that "Lyndon gets so angry at Matt's mistake that he yeets a rock at him that weighs 2.8g with a whopping speed of 373.23 $\frac{+}{-}$ .34 m/s. What is the indeterminancy of position of the rock?"

In the example, they multiplied .34 by 2 to get $\Delta v=.68$.
Last edited by rachelle1K on Tue Nov 05, 2019 8:49 pm, edited 1 time in total.

Deepika Reddy 1A
Posts: 103
Joined: Thu Jul 11, 2019 12:15 am

Re: Solving with Heisenber

This is because when they use the + or - , you should use the range. You do this by multiplying the value by two so that you get the range and can substitute that into the equation.

Katie Kyan 2K
Posts: 96
Joined: Fri Aug 09, 2019 12:16 am
Been upvoted: 1 time

Re: Solving with Heisenber

When the problem gives you the uncertainty in the + or - form, you have to multiply that value by two because it gives you the range of uncertainty. In the Dino nuggets problem since the uncertainty was + or - 0.34 m/s, the range of values the velocity can take on is (373.23+0.34) - (373.23-0.34) = 0.68m/s. Therefore you substitute 0.68 m/s as the uncertainty for velocity.

805317518
Posts: 35
Joined: Wed Sep 11, 2019 12:16 am

Re: Solving with Heisenberg

I have a follow-up question. How do you apply Δv into the equation? In other words, what is Δv in terms of Δp?

Victor James 4I
Posts: 50
Joined: Wed Sep 18, 2019 12:20 am

Re: Solving with Heisenberg

805317518 wrote:I have a follow-up question. How do you apply Δv into the equation? In other words, what is Δv in terms of Δp?

p = mv so Δp = mΔv since mass is constant