The smallest unit of charge is −1.6×10−19 c, which is the charge in coulombs of a single electron. robert millikan was able to measure the charge on small droplets of oil by suspending them between a pair of electrically charged plates. which of the values are possible charges of those oil droplets?

The possible charges of those oil droplets from the given choices are:

Explanation:

Since the minimum amount of charge is - 1.6 × 10⁻¹⁹ C, the charge of any matter must be a multiple of that number.

So, find which of the given choices is a multiple of - 1.6 × 10⁻¹⁹ C.

You do that by dividing each choice by - 1.6 × 10⁻¹⁹ C. If the division is a whole number (zero remainder) then the choice is a multiple of - 1.6 × 10⁻¹⁹ C and is a possible charge of the oil droplets:

Since all the powers are 10⁻¹⁹ you must only divive the mantissas:

Option A. - 1.2 × 10⁻¹⁹ C

Option B: - 3.2 × 10⁻¹⁹ C

Option C. - 4.8 × 10⁻¹⁹ C

Option D. - 5.6 × 10⁻¹⁹ C

Option E. - 8 × 10⁻¹⁹ C

Option F. - 9.4 × 10⁻¹⁹ C

im not exactly sure but i think its b!