Posted by **linds** on Saturday, April 21, 2012 at 12:43pm.

An object is moving along a straight line and the uncertainty in its position is 1.1 m.

(a) Find the minimum uncertainty in the momentum of the object.

(b) Find the minimum uncertainty in the object's velocity, assuming that the object is a golf ball (mass = 0.045 kg).

(c) Find the minimum uncertainty in the object's velocity, assuming that the object is an electron.

- Physics please help! -
**Elena**, Saturday, April 21, 2012 at 3:08pm
ΔxΔp≥Һ/2

ΔxΔp=Һ/2

Δp = Һ/2 Δx = 6.6310^-34/21.1 = 310^-34 kgm/s,

Δp = mΔv

Δv = Δp/m = 310^-34/0.045 = 6.710^-33 m/s,

Δv = Δp/m = 310^-34/9.110^-31 = 3.310^-4 m/s.

- Physics please help! -
**linds**, Sunday, April 22, 2012 at 2:02pm
Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

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