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## Homework Statement

18. A ball of mass 50 g moves with a speed of 30 m/s. If its

speed is measured to

**an accuracy of 0.1%**, what is the

minimum uncertainty in its position?

19. A proton has a kinetic energy of 1.0 MeV. If its momentum

is measured

**with an uncertainty of 5.0%**, what is

the minimum uncertainty in its position?

## Homework Equations

[tex]\Delta[/tex]p[tex]\Delta[/tex]x [tex]\geq[/tex][tex]\frac{h}{4\pi}[/tex]

## The Attempt at a Solution

I know how to solve #19, because I know that [tex]\Delta[/tex]p / p = uncertainty. But what about accuracy? Do they mean the same thing? How does accuracy relate to [tex]\Delta[/tex]p or [tex]\Delta[/tex]x or the uncertainty of one of those?

Thanks!