The mass of a dust particle is approximately 7.5x10^-10 kilograms and the mass of an electron is 9.1x10^-31 kilograms. How many electrons does it take to equal the mass of a dust particle?
To find out how many electrons are needed to equal the mass of a dust particle, we first need to determine the mass of the dust particle in terms of electron masses.
We can do this by dividing the mass of the dust particle by the mass of a single electron:
Mass of dust particle / Mass of electron = (7.5x10^-10 kg) / (9.1x10^-31 kg)
= (7.5 / 9.1) x 10^-10 / 10^-31
= 0.824 x 10^21
Therefore, it would take approximately 0.824 x 10^21 electrons to equal the mass of a dust particle.