Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: Millikan Apparatus- best one ?

On Wed, 9 Oct 1996, Leigh Palmer wrote:
Has anyone in this group ever had a student who succeeded in
demonstrating the quantization of charge doing this experiment?
How many one-pass datasets were taken? how many different drops
were measured?

One way to demonstrate the quantized nature of charge concentration on the
oil drop is to plot a graph. We ask our students to 'fit' an n-value to the
ratio of the speed of rise to the speed of fall (actually [1 + v(r)/v(f)]
using a Spreadsheet program. Occasionally, students find a data point that
does not fit. Having captured their data on video tape, they can once
again review the measurements to verify that there may have been a change
of charge on the drop during its time of rise. I suspect that this method
helps re-enforce the concept of quantization of charge.

PS. On Monday, this week, one student managed to identify 11 charges on one

Don Stenton voice: (604) 721-7709
Dept. of Physics and Astronomy fax: (604) 721-7715
University of Victoria, e-mail:
Victoria, B.C. Canada V8W 3P6