# What is Millikan: Definition and 38 Discussions

Herman A. "Bud" Millikan (October 12, 1920 – January 28, 2010) was the head coach of the University of Maryland Terrapins men's basketball team from 1950 to 1967. He compiled a 243–182 record.

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1. ### Calculating Velocity in the Millikan Oil Drop Experiment

Hi, I try to find the velocity for a oil drop. I found the forces. ##F=ma => m\frac{dv}{dt} = \frac{4\pi a^3(\rho - \rho_1)g}{3} - 6\pi n a v## with v on the right side, I don't see how to get the solution. I found the solution on few websites, but without the path to find the solution from...
2. ### Millikan Experiment Based Marble Mass Homework

I arranged the masses in ascending order: 11.0 g 11.1 g 20.6 g 21.4 g 21.5 g 25.7 g 25.8 g 25.9 g 31.6 g 31.9 g I found the average mass of the marbles: 22.65 g I found the difference in masses of the marbles: 0.1 g 9.5 g 0.8 g 0.1 g 4.2 g 0.1 g 0.1 g 5.7 g 0.3 g I found the average of the...
3. ### What Are the Results of the Millikan Oil Drop Experiment?

mass: 1.57x10^-19 kg voltages: 400, 457, 384, 369, 400, 355, 369, 436, 384, 369 distance: 0.1m gravity: 9.81 m/s^2
4. ### Find the Mass of the Candy Knowing the Total Mass of the Bags

[Mentors' note: There's no template because this thread was moved from General Physics. The specification of the problem seems adequate without the template] Hi everyone, I am working through stuff based on the Millikan Oil Drop experiment. There is a question that asks to determine the mass...
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### Millikan Oil Drop Experiment: Determining Elementary Charge

Homework Statement Calculate the charge on each oil drop and determine the elementary charge on an electron given the following: Voltage (Attached) d (Distance between two charged plates) = 0.10m m (Of the droplet) = 1.57x10^-15 kg g = 9.8 kgm/s^2 Homework Equations q = mg*d / ΔV The Attempt...
6. ### Millikan Oil drop lab experiment - equation for speed of drop

Millikan Oil drop experiment. For my current lab, we are recreating the milian oil drop experiment to measure the charge of an electron. However, we are using 1-micron diameter latex spheres in place of oil drops. Problem: I am having difficulty deriving an equation for the speed of the drop...
7. ### How many electron charges are there on the drop? (Millikan)

Homework Statement In a measurement of the electron charge by Millikan's method, a potential difference of 1.5 kV can be applied between horizontal parallel metal plates 12 mm apart. With the field switched off, a drop of oil of mass 10-14 kg is observed to fall with constant velocity 400 μm...
8. ### Millikan oil drop experiment charge determination

Howdy y'all! If you could help with the following question, my physics class and I would be extremely grateful. A charged oil droplet is suspended motionless between two parallel plates (d=0.01m) that are held at a potential difference V. Periodically, the charge on the droplet changes as in...
9. ### Why Did Water Droplets Fail to Suspend in Millikan's Early Experiment?

Homework Statement When Millikan first performed this experiment, he used water droplets instead of oil. He found he could not suspend the droplets; they would start to move up. Why did this happen? Homework Equations N/A The Attempt at a Solution The water droplets would have been so small...
10. ### How can I find the smallest positive integer number without dividing q by e?

I've got mg=kvf, when the e-field is zero, (taking downwards direction as positive), k is some constant and vf is the terminal velocity of an oil drop. Then when the e-field is on, mg+kve=Eq, where Eq is the force from the electric field, and k is the same constant and ve is the drift velocity...
11. ### Help about millikan oil drops apparatus?

Homework Statement in a millikan type apparatus, the horizontal plates are 2 cm apart. with the field switched off, an oil drop is observed to fall with a steady velocity of 2 x 10^-4 m/s. when the field is on, the upper plate being positive and the drop just remains stationary when the pd...
12. ### Determine Mass of Penny: Millikan Experiment

First post on this forum so hoping it is in the right place. In class today we did an experiment where our teach took two paper cups, and placed X amount of pennies in one before stacking the other cup inside of it. We had 10 of these cup/penny contraptions each and a scale. The purpose of...
13. ### What is the charge of the oil drop in Millikan's experiment?

Homework Statement When an oil drop falls freely, the velocity first increases, but afterwards it quickly reaches a constant speed, since the air resistance becomes equal to the weight of the oil drop. The air resistance is given by: Fair=6\pir\etav, where \eta is the viscosity of air...
14. ### Clarifying the Basics of the Millikan Oil Drop Experiment

In the Millikan oil drop experiment, was the oil particles positively or negatively charged. and what were the charges of the plates. My textbook and what my gr.10 notes say is that the oil droplets and the bottom plate were positive, but every source online says that they were negative and that...
15. ### Can Millikan's Oil Drop Experiment Accurately Measure the Elementary Charge?

Homework Statement Hi, I had to calculate the charge of an oil drop using a lab simulation Homework Equations q = mgd/v The Attempt at a Solution This is the result i came up with: The charges are not multiple of 1.6x10^-19 C. How can i fix this? Thanks
16. ### Millikan Oil Drop Experiment Question

Homework Statement A 1.50 x 10^-14 kg oil drop accelerates downward at a rate of 1.80 m/s^2 when placed between two horizontal plates that are 9.40 ch apart. The potential difference between the two plates is 980 V. Determine the magnitude of the charge on the oil drop. m = 1.50 x 10^-14 kg...
17. ### Millikan Oil Drop Experiment - A few questions

Millikan Oil Drop Experiment -- A few questions Homework Statement I'm currently doing the millikan oil drop lab; we're using a PASCO Scientific Model 300a (fairly ancient). Specifically, my partner and I are having major problems making any of the droplets in the viewing chamber go back up...
18. ### Millikan oildrop experiment: archimedes' principle

Hello! My physics teacher gave me an assignment to work out (theoretically) how Millikan's oildrop experiment works. The simple principle of the experiment (as far as I know): E = \frac{F}{Q} F = mg mg = qE \rightarrow q = \frac{mg}{E} However, after reading a bit on Wikipedia it...
19. ### Is It Accurate to Measure the Elementary Charge with Just One Oil Drop?

I completed the Millikan oil drop lab in class with as much accuracy as possible. I used the PASCO interface and used a very accurate Air pressure calibration. My final experimental charge of the electron derived from the equation in the lab was, 1.8 x 10 ^-19 C. When I turned in my lab, I was...
20. ### Millikan Oil Drop: Atom Size & Ions

Hello, in the Millikan experience have the oil drops vaporized similar dimensions to one atom of oil or they are still too big? And do they need to be ionized to interact with the electric field of the plates? Thanks
21. ### What Are the Extremes of Elementary Charges Measured in the Millikan Experiment?

Homework Statement For the shortest bar on the bar graph, what is the smallest number of elementary charges that were measured within experimental uncertainty? For the tallest bar, what was the largest number of elementary charges? Homework Equations The Attempt at a Solution I...
22. ### Why the chamber for the Millikan Oil Drop experiment is so large?

1. The question asks, why is the external chamber in the Millkan Oil Drop experiment so large? The Millikan Oil Drop is a classic experiment for determing the value of e, fundamental charge, on an electron. In my version of the experiment, I spraw droplets into an external chamber, and then...
23. ### What is the charge on the oil drop in Millikan's oil drop experiment?

Homework Statement A 1.50x10-14 kg oil drop accelerates downwards at a rate of 1.80 m/s2 when placed between two horizontal plates that are 9.40 cm apart. The potential difference between the two plates is 980 V. Determine the magnitude of the charge on the oil drop. Homework Equations...
24. ### Millikan oil drop experiment lab help

Homework Statement I'm doing Millikan's oil drop experiment in a lab. I've got a set of measurements and all that, but in analysis of the data I can't seem to get values for the charges on individual drops that seem reasonable. I find that each drop is carrying between 10 and 300 elementary...
25. ### Determining Mass of Individual Objects in Bags - Oil, Candy, Millikan?

hello everyone, we have to design a procedure to determine the mass of an individual object inside a bag which is filled with many of these identical objects ( one kind) For ex. Bag 1; mass = 435.6, filled with candy- find mass of individual candy. we have: 10 bags of one candy 10...
26. ### Recreating the Millikan Experiment: Analysis and Error Considerations

We've had to recreate the famous Millikan oil drop experiment in our labs and taken values of the velocities of oil drops under the influence of gravity and charged capacitor plates and the balancing voltage required to stop the droplet from moving up or down. We took 120 results and they...
27. ### Millikan oil drop experiment potential difference

Homework Statement in a Millikan oil drop experiment, a uniform electric filed of 1.92 x 10^5 N/C is maintained in a region between two plates separated by 1.5 cm. Find the potential difference between the plates. Homework Equations mg = q x E The Attempt at a Solution in order to...
28. ### How Does the Millikan Oil Drop Experiment Illustrate the Balance of Forces?

Homework Statement An oil drop with a mass of 7.20*10^-16kg moves upward at a constant speed of 2.50 m/s between two horizontal, parallel plates. If the electric field strength between these plates is 2.20*10^4 V/m, what is the magnitude of the charge on the oil drop? Homework Equations...
29. ### Solve Millikan Experiment Homework: Calculate Mass of Bearing

Homework Statement You are given twelve cans (one of which is empty) which are filled with a certain number of ball bearings. Using nothing more than a balance, calculate the mass of a single bearing Homework Equations Total Mass=Mo+n(mo) Where total mass=mass of ball bearings...
30. ### How Can You Calculate Mass and Charge in the Millikan Oil Drop Experiment?

Homework Statement If the charge to mass ratio of a particle, e/m, is known derive a formula to find m, and then by proxy e. Drops of oil are allowed to drop down through a potential difference. With the electric field you can keep a particle suspended for however long you need, droping...
31. ### Millikan Experiment: Calculating Charge and Excess Electrons

In Millikan type experiment, 2 plates parallel 1 cm apart. Sphere mass of 2.2x 10^-31 Kg doesn't move when potential diff is 350V with upper plate negative a) What charge is sphere + or - b) magnitude of charge on sphere? c) How much excess or deficit of electrons does it have. MY...
32. ### The Millikan Oil Drop Experiment (calculating e given a series of charges)

Homework Statement This is a lab, where we have to calculate the constant e (1.602e-19 C) by calculating the terminal velocity of an oil drop while under the influence of gravity, and the terminal velocity while under the influence of gravity and a known electric field. Homework...
33. ### Millikan Oil Drop Experiment: Solving Homework Equations

Homework Statement In a Millikan experiment the distance of rise or fall of a droplet is .60 cm and the average time of fall (ie field off) is 21.0 s. With the field turned on, the observed successive rise times are 46.0, 15.5, 28.1, 12.9, 45.3 and 20.0 s a) Prove that charge is quantized...
34. ### How did Millikan show the electron charge to be quantized?

In all of the physics books I have, the story is Millikan, in measuring (calculating) the charge found on tiny oil drops, "found them all to be integer multiples of a single, fundamental unit", the electron charge -e. The question I have is, HOW did he show them to all be multiples of a...
35. ### Millikan Oil-Drop Exp: Help With Homework

Homework Statement About 100 years ago, the American physicist Robert Millikan carried out a famous experiment known as the Millikan oil-drop experiment, in which he measured the charge on tiny droplets of oil. Millikan found the charge on these droplets to be quantized, and thus came up with...
36. ### How Can We Accurately Determine the Number of Small Marbles in Each Bag?

We had to conduct a similar practice to Millikan's oil drop experiment in class. This is the situation: There are 10 bags each containing a different amount of small marbles of the same mass. There is also one big marble of different mass to the small marble added to each bag. Each bag is...
37. ### Was Millikan's Oildrop Experiment Ethically Sound?

How did Millikan do it? I've just completed Millikan's Oildrop experiment (with mixed results) and we haven't actually found the charge of an electron, but simply just tried to demonstrate the quantisation of charge by assuming a value of e = 1.6022e-19C. Question is how on Earth did...
38. ### 3real life applications of the Millikan Experiment or parallel plates.

Can someone give me three real life applications of the Millikan Experiment or parallel plates? Also if possible can you give me a little description of how it works. Also, we are not allowed to use a tv,computer monitor or a printer.