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twinchristiansp4xhd2
29.06.2019 •
Physics
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.
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Ответ:
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:
Ответ:
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