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In the Electric Mist (2008)
IMDB rating: 6.30
Plot: New Iberia Lt. Dave Robicheaux is trying to link the murder of a local hooker to New Orleans mobster Julie (Baby Feet) Balboni-back in his home parish as co- producer of Hollywood director Michael Goldman’s Civil War film-when sizzled/psychic movie-star Elrod Sykes, pulled over for drunk driving, starts babbling about a corpse he found in the Atchafalaya Swamp-the corpse of a black man Dave had seen murdered 35 years before.
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Directors: Tavernier Bertrand
Actors: Jones Tommy Lee,Goodman John,Sarsgaard Peter,Beatty Ned,Gammon James,Vince Pruitt Taylor,Helm Levon,Guy Buddy,Cedillo Julio,Austin Randy,Bayard Jason J.,Drama,
millikan oil drop experimet, help please?
Im writing a research about it and this is what i wrote so far!
Robert Andrews Millikan was a significant person in the development of physics. Millikan was born in Morrison, Illinois on March 22, 1868.
Physicists know that the charge on an electron is the fundamental unit of electric charge. This amount of charge, 1.6*E-19 coulombs, is the smallest amount of charge that can occur in nature. This fundamental electronic charge cannot be broken into smaller amounts of charge.
Robert Andrews Millikan first accurately measured the value of the fundamental electric charge with his famous oil drop experiment. He also verified many other laws and equations. Therefore, he was awarded the Nobel Prize in 1923.
In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron. He began by measuring the course of charged water droplets in an electrical field. The results suggested that the charge on the droplets is a multiple of the basic electric charge; unfortunately his experiment was not very accurate so no one considered it because the water evaporated quickly. He obtained more precise results in 1909 with his famous oil-drop experiment in which he replaced water with oil. Shortly after his experiment was written in newspapers and magazines in 1910, Millikan was rewarded with a full professorship.
The Millikan oil-drop experiment was far greater to previous determinations of the charge of an electron. Where other scientists had attempted to measure the quantity by observing the effect of an electric field on a cloud of water droplets, Millikan used single drops, first of water and then of oil after he found out that water evaporates too quickly.
The apparatus associated with Millikan’s oil-drop experiment is a closed cavity with see-through sides is fitted with two parallel metal plates, which obtain a positive or negative charge when an electric current is applied. At the start of the experiment, an atomizer sprays a fine mist of oil droplets into the upper portion of the chamber. Under the influence of gravity and air resistance, some of the oil droplets fall through a small hole cut in the top metal plate. When the space between the metal plates is ionized by radiation, for example X-rays, electrons from the air attach themselves to the falling oil droplets, causing them to acquire a negative charge. A light source, set at right angles to a viewing microscope, illuminates the oil droplets and makes them appear as bright stars while they fall.
The mass of a single charged droplet can be calculated by observing how fast it falls. By adjusting the potential difference, or voltage, between the metal plates, the speed of the droplet’s motion can be increased or decreased; when the amount of upward electric force equals the known downward gravitational force, the charged droplet remains stationary. The amount of voltage needed to suspend a droplet is used along with its mass to determine the overall electric charge on the droplet
can you please tell me what should i add or remove and what can i do to make this research better. And yea the teacher told me that I would have to present it too. so what should i do to make it look interesting and make it better?
please help
First, the text is fine overall. What is unclear is the description of the plates in the apparatus:
You write "…with two parallel metal plates, which obtain a positive or negative charge when an electric current is applied. At the start …"
Better: "… with two parallel metal plates, one on top and one below. In the experiment, the upper plate is charged positively with respect to the lower plate so that it pulls electrons - which are charged negatively - upwards. The idea is to have small oil droplets negatively charged and then have them hover at a fixed position. The electrical force and the size and therefore weight of an oil droplet can then be used to find the charge in the droplet. At the start …"
Also, you could include the math - it is not very hard (depending on which class you are in), but somewhat boring. So for a presentation, this is less than ideal …
Now, I’m not sure your teacher requires you to present this experiment - this is too hard! However, you can invent some experiment showing the same effect. And idea would be: Use a fan blowing upwards to have some balloons hover at a constant height. You would need to
* electrically control the speed of the fan (using a dimmer)
* make sure the fan blows up in a wide area, otherwise the balloons will fall down on the sides (maybe, 3 or 4 identical fans at the corners of a small table would be better - maybe you can get very cheap ones)
* put small weights of different weight below the balloons.
* have balloons of different sizes - indicating a different charge (on which the eletrical force = your fans pull).
If I have another idea how to demonstrate this, I’ll let you know …
Hope this helps!
Harald M | Oct 10, 2009
