## 25.

$\lambda=\frac{h}{p}$

John Liang 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:18 am

### 25.

How does one find the needed uncertainty in velocity of the electron?

Paige Lee 1A
Posts: 136
Joined: Sat Sep 07, 2019 12:16 am

### Re: 25.

Do Δp*Δx ≥ h/4pi, and then plug in the Δp value into this equation: Δp=mΔv and solve for Δv

905385366
Posts: 54
Joined: Sat Jul 20, 2019 12:16 am

### Re: 25.

I was looking at the solutions manual and the value for h is not planks constant (6.626x10-34) but some other value. Can somebody explain why it is different?

Posts: 54
Joined: Sat Jul 20, 2019 12:17 am

### Re: 25.

For velocity in that problem you just need two equations. delta p times delta x is greater than or equal to h/4pi being the first equation and delta p=m times delta v being the second equation. Knowing these are what you need you can simply plug in the information you know and solve for the change in velocity.

Tiffany_Chen 2K
Posts: 106
Joined: Fri Aug 30, 2019 12:15 am

### Re: 25.

905385366 wrote:I was looking at the solutions manual and the value for h is not planks constant (6.626x10-34) but some other value. Can somebody explain why it is different?

The value given should be h/4pi, which is used in Heisenberg's indeterminacy equation.