### Example 1.7

Posted:

**Wed May 02, 2018 1:34 am**Hello!

In text example 1.7 (p. 18) -

Estimate the minimum uncertainty in:

(a) the position of an object as heavy as a marble of mass 1.0 g given that its speed is known within +1.0mm/s and

(b) the speed of an electron confined to within the diameter of a typical atom (200. pm).

Why is v = 2 x (1.0x10^-3 m/s)?

I would think this would simply be 1.0x10^-3 m/s because the "speed is known within +1.0mm/s" not +2.0mm/s?

In text example 1.7 (p. 18) -

Estimate the minimum uncertainty in:

(a) the position of an object as heavy as a marble of mass 1.0 g given that its speed is known within +1.0mm/s and

(b) the speed of an electron confined to within the diameter of a typical atom (200. pm).

Why is v = 2 x (1.0x10^-3 m/s)?

I would think this would simply be 1.0x10^-3 m/s because the "speed is known within +1.0mm/s" not +2.0mm/s?