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.

Explanation:

For this case we know that the charge associated to the transferred electrons of the small spark is and we want to find the number of electrons transferred.

From the properties of matter we know that the charge of the electron is

And we know that the total charge is given by this expression:

Where Q represent the charge, n the number of electrons and e the charge of the electron.

If we solve for n we got:

And replacing we got: