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An atom of iron has a radius of 156pm and the average orbital speed of the electrons in it is about 5.7x10 7 m/s. Calculate

An atom of iron has a radius of 156pm and the average orbital speed of the electrons in it is about 5.7x10⁷m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of iron. Write your answer as a percentage of the average speed, and round it to 2 significant digits.

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