An atom of argon has a radius of 71.pm and the average orbital speed of the electrons in it is about ×3.9107/ms. calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of argon. write your answer as a percentage of the average speed, and round it to 2 significant digits.

2.1 %

Explanation:

The radius of the Argon atom, r = 71 pm = 7.1 × 10 ⁻¹¹ m

Average orbital speed of electrons, v = 3.9 × 10⁷ m/s

From uncertainty principle:

Δx m Δv ≥ h/4π

mass of electron, m = 9.1 ×10⁻³¹ kg

Δx = radius of the argon atom = 7.1 × 10 ⁻¹¹ m

Percentage uncertainty:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

friction

explanation:

they us to move forward and backwards