Part A A person shuffles across the rug and then place his finger near his frien

Question

Part A

A person shuffles across the rug and then place his finger near his friend's nose, causing a small spark that transfers about 10^9C of charge from the person to his friend. Determine the number of electrons transferred. e=1.6×10^19C.

Express your answer using two significant figures.

Part B

Estimate the fraction of electrons in person's 70-kg body that were transferred to his friend. Note that the electron mass is about 1/20000 the mass of the atom the nuclei are much more massive and the mass of an average atom in the body is about 2×10^26 kg . Assume that each atom has 5 electrons on average. (Note: Don't get hung up on minutia this is a rough estimate.)

Express your answer using one significant figure.

Explanation / Answer

A)

chqrge = ne

10^-9 = n x 1.6 x 10^-19

n = 6.25 x 10^9 electrons

B)

no of atoms = 70/2x10^-26 = 3.5 x 10^27 atoms

total electrons = 5x 3.5x 10^27 = 1.75x 10^28

fraction = 6.25x10^9/1.75 x 10^28 = 3.57 x 10^-19

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