Explain the Nature of probe spacing for vibroflotation ?

Using the given charge-to-mass ratios for electrons andprotons, and knowing the magnitudes of their charges areequal, what is the ratio of the proton’s mass to the electron’s?(Note that since the charge-to-mass ratios are given to onlythree-digit accuracy, your answer may differ from theaccepted ratio in the fourth digit.)

Neglect the buoyancy force on an oil droplet and show that the terminal speed of the droplet is vt  mg/b, where b is the coeffi cient of friction when the droplet is in free fall.