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Millikan's Struggle with Theory
FEATURES Did the great experimentalist doctor his own findings to suit his beliefs? Perhaps not, as aclose look at his beliefs reveals. Millikan's struggle with theory Gerald Holton n 1916 Millikan published his experi by any other experimenter. rectly at the ordinates, he decided"simply I mental determination of the value of Several factors were responsible for the to cut the feet off"where those curves were Planck's constant, with remarkable preci success of the experiment, performed at trailing on too far. sion. Itwas later cited as part ofhis Nobel the Ryerson Laboratory ofthe University In short, a triumphant work by a su Prize award. But as a study of that paper ofChicago. First ofall, Millikan's use ofan perbly confident scientist, ofhighest im together with Millikan's subsequent com ingenious device he termed "a machine portance in its day, and richly deserving to ments over the years reveal, he initiallyre shop in vacuo;' assembled thanks to "the be cited as part of his Nobel Prize award fused to accept the interpretation of the skill and experience of the mechanician, in 1923, "for his work on the elementary theoretical meaning ofhis work, as seen Mr. Julius Pearson" .Essentially, the device charge ofelectricityandthe photoelectric from the perspective of a present-day allowed a rotating sharp knife, controlled effect". If historically minded scholars physicist.Yet, over time, Millikan adjusted from outside the evacuated glass contain look through that 1916 volume of the his view retroactively to accept the mean er by electromagnetic means, to clean off Physical Review inwhich Millikan's paper ing ofwhat he had done - namely to pro the surface of the metal used (sodium, appeared, they will notice that physics in vide crucial support for Einstein's heuris potassium, lithium) before exposing it to America at that time was still a mixed bag. -
Millikan Oil Drop Experiment
Experiment 4 1 Millikan Oil-Drop Experiment Physics 2150 Experiment 4 University of Colorado1 Introduction The fundamental unit of charge is the charge of an electron, which has the magnitude of 푒 = 1.60219 x 10-19 C. With the exception of quarks, all elementary particles observed in nature are found to have a charge equal to an integral multiple of the charge of an electron. (Quarks have charge 푒/3, but they are never observed as free particles). By convention, the symbol 푒 represents a positive charge, so the charge 푞 of an electron is 푞 = −푒. The first person to measure accurately the electron’s charge was the American physicist R. A. Millikan. Working at the University of Chicago in 1912, Millikan found that droplets of oil from a simple spray bottle usually carry a net charge of a few electrons. He built an apparatus in which tiny oil droplets fall between two horizontal capacitor plates while their motion is observed with a microscope. A voltage applied between the plates creates an electric field, which can exert an upward force on a charge droplet, counteracting the force of gravity. By studying the motion of a droplet in response to gravity, the electric field between the plates, and viscous drag due to the air, Millikan was able to calculate the charge on the droplet. He published data on 58 droplets and reported that the charge of an electron is 푒 = (1.592±0.003) x 10-19 C. Millikan’s value was a bit low (three 휎 below the accepted value) because he used a slightly inaccurate expression for the drag force due to air. -
Tournament-9 Round 12 Tossups 1
Tournament-9 Round 12 Tossups 1. This psychologist argued that "moving toward others," "moving against others," and "moving away from others" were the three unhealthy trends. She organized the Association for the Advancement of Psychoanalysis after being expelled from the New York Psychoanalytic Institute. She argued against the concept of the death instinct and libido in works such as Feminine Psychology and The Neurotic Personality of Our Time. (*) For 10 points, name this psychologist, who introduced the concept of womb envy. ANSWER: Karen Horney 030-09-6-12102 2. The magnitudes of constructs of this type are related to J-coupling constants in proton NMR spectroscopy, according to the Karplus equations. One construct of this type is also known as the "dihedral" type, and applies when four or more atoms are bonded in a straight chain. For a central molecule with two sigma bonds, the magnitude of a construct of this type (*) decreases by one-third when a lone pair is present, which is the major difference between a linear and a bent molecule. For 10 points, name these figures important in molecular geometry, which come in "bond" and "torsional" varieties, and are typically measured in degrees. ANSWER: angles [or torsional angles; or bond angles; or dihedral angles] 026-09-6-12103 3. This deity trips a figure named Lit and kicks him into a pyre. This deity, assisted by some items given by Grid, defeats Geirrod, but fails to wrestle Eli, who is really Old Age. This deity cannot pick up the cat of (*) Utgard-Loki, but does make Thialfi into his apprentice. -
Southern Palm Zen News
Southern Palm Zen News December 2011 Volume 5, Number 12 In This Issue Shuso for Zochi Shuso Hossen for Winter Special Events Prison Outreach 2011-12 Calendar Gary Zochi Faysash Sangha Bulletin Board Saturday, December 17, 2011 Our Website Shuso Hossen or Dharma Combat is a ceremonial rite- www.floridazen.com of-passage marking a student’s promotion to the rank of senior student. look here for recommended At Hossen, the Shuso gives his first dharma talk and takes questions resources and readings for from the community in a ceremonial conversation. Zochi’s dharma talk students of zen will arise from insights obtained while studying the koan “Mind is Buddha”. Our Schedule Please read the koan below and consider what questions you might ask Tuesday & Thursday him on that day. Also, you are invited to present a poem or short piece Morning of prose or some other original work to honor the Shuso. Zazen 7:00 a.m. – 8:00 a.m. Schedule for Saturday, December 17, 2011 7:15–7:30 a.m. SERVICE Short Break Wednesday Evening 7:30–8:00 ZAZEN 8:40 – 9:00 SET UP FOR SHUSO HOSSEN Orientation to Zen & 8:00–8:10 KINHIN-INTERVIEWS 9:00 – 10:00 SHUSO HOSSEN Meditation: CEREMONY 5:30 – 6:00 p.m. 8:10–8:40 ZAZEN-FOUR VOWS 10:00 - 11:00 BREAKFAST Study Group To help us plan seating and food, please RSVP to [email protected]. 6:00 – 7:00 p.m. Service & Zazen 7:00 – 8:00 p.m. KOAN# 30 FROM THE GATELESS BARRIER: MIND IS BUDDHA Saturday Morning THE CASE Service & Zazen 7:15 – 9:10 a.m. -
EDITORIAL Sages of the Profession: Celebration of Our Heritage
EDITORIAL Sages of the Profession: Celebration of our Heritage Gerald T. Powers Virginia Majewski Special Issue Co-Editors The Indiana University School of Social Work recently celebrated its 100-year anniversary as the oldest school of social work continuously affiliated with a university. That seminal occasion served as a compelling reminder of the extraordinary history of our profession and its relentless efforts on behalf of the vulnerable, oppressed and disadvantaged members of society. For more than a decade, the School’s journal Advances in Social Work has been devoted to the dissemination of theory and research that supports these efforts of social work educators and practitioners. Thus it seemed only appropriate that we devote a special issue of Advances to a retrospective exploration of some of the critical events in the history of the profession that have contributed to and help shape our present understanding of social work practice and education. The intent of this special issue is to chronicle the rich heritage of the social work profession and its educational initiatives as seen through the eyes of those who have actually lived and contributed to that heritage. Accordingly, the editorial board felt that the best way to document some of these critical events would be to invite a group of nationally recognized scholars to provide first-person, eyewitness accounts of their observations and direct involvement with the events as they unfolded. The initial challenge in creating this special issue was to identify a representative group of social work “sages,” that is, those individuals with the professional and academic credentials that would qualify them to speak authoritatively about the landmark events and challenges in the history of the profession. -
Annual Awards
ANNUAL AwARDS Rehan Muttalib ’09 TEAM AwARDS Coach bob blackman trophy Jake crouthamel award Kenneth t. young award To the player, selected To the junior or sopho- To the junior or sopho- by the coaching staff, more offensive player, more defensive player, who has contributed selected by the coaching selected by the coaching most to the success of staff, who has contrib- staff, who has contrib- the team . Gift of L . G . uted most to the success uted most to the success Balfour Company . of the team . Gift of Ken- of the team . Gift of Ken- neth Young ’48 . neth Young ’48 . Ian Wilson, SS Tim McManus, WR Peter Pidermann, FS 2008 Winner 2008 Winner 2008 Winner 1959 Bill Gundy, QB 1972 Rick Klupchak, HB 1978 Cody Press, DB 1960 Alan Rozycki, HB 1973 Tom Snickenberger, QB 1979 Jerry Pierce, LB 1961 Gary Spiess, HB 1974 Reggie Williams, LB 1980 Scott Hacker, LB 1962 Bill King, QB 1975 Pat Sullivan, OG 1981 Joe Moore, DB Don McKinnon, C-LB 1976 Sam Coffey, TB 1982 Steve Karol, LB 1963 Scott Creelman, E 1977 Jeff Hickey, LB 1983 Don Pomeroy, LB 1964 Jack McLean, DB 1978 Jeff Dufresne, TB 1984 Peter Kortebein, LB 1965 Ed Long, E 1979 Dave Shula, SE 1985 Tom Ramsey, DT 1966 Pete Walton, FB 1980 George Thompson, OG 1986 Brett Matthews, DB 1967 Steve Luxford, HB 1981 Wayne Ferree, OT 1987 Paul Michael, LB 1968 Randy Wallick, OE 1982 Jack Daly, WR 1988 Kevin Luensmann, DT 1969 Tom Quinn, HB 1983 Rich Weissman, TB 1989 Peter Chapman, DT 1970 John Short, HB 1984 Doug Keare, TE 1990 Sal Sciretto, DB 1971 Stuart Simms, FB 1985 Dave Gabianelli, QB Harry -
What Keeps Us Going: Factors That Sustain U.S
WHAT KEEPS THEM GOING: FACTORS THAT SUSTAIN U.S. WOMEN'S LIFE-LONG PEACE AND SOCIAL JUSTICE ACTIVISM SUSAN MCKEVITT A DISSERTATION Submitted to the Ph.D. in Leadership & Change Program of Antioch University in partial fulfillment of the requirements for the degree of Doctor of Philosophy August, 2010 This is to certify that the dissertation entitled: WHAT KEEPS THEM GOING: FACTORS THAT SUSTAIN U.S. WOMEN'S LIFE-LONG PEACE AND SOCIAL JUSTICE ACTIVISM prepared by Susan McKevitt is approved in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Leadership and Change. Approved by: ________________________________________________________________________ Laurien Alexandre, Ph.D., Chair Date ________________________________________________________________________ Jon Wergin, Ph.D., Committee Member Date ________________________________________________________________________ Philomena Essed, Ph.D., Committee Member Date ________________________________________________________________________ Bettina Aptheker, Ph.D., External Reader Date Copyright 2010 Susan McKevitt All rights reserved Dedication This study is dedicated to all the peace and social justice activists who have been, now are, and are yet to be. For those who have been, know that your struggles were not in vain for they bore fruit of which you never could have dreamed. For those currently in the fray, know that the role you play in the continuum of creating peace and social justice is honoring of those who have come before and critical for those yet to come. You, too, may not see the fruits of your labors, yet you persist anyway. And, for those who are contemplating joining this glorious community of activists, know that your participation will feed your souls, lighten our hearts, and help us to keep going as your vitality and exuberance will strengthen us. -
Moremore Millikan’S Oil-Drop Experiment
MoreMore Millikan’s Oil-Drop Experiment Millikan’s measurement of the charge on the electron is one of the few truly crucial experiments in physics and, at the same time, one whose simple directness serves as a standard against which to compare others. Figure 3-4 shows a sketch of Millikan’s apparatus. With no electric field, the downward force on an oil drop is mg and the upward force is bv. The equation of motion is dv mg Ϫ bv ϭ m 3-10 dt where b is given by Stokes’ law: b ϭ 6a 3-11 and where is the coefficient of viscosity of the fluid (air) and a is the radius of the drop. The terminal velocity of the falling drop vf is Atomizer (+) (–) Light source (–) (+) Telescope Fig. 3-4 Schematic diagram of the Millikan oil-drop apparatus. The drops are sprayed from the atomizer and pick up a static charge, a few falling through the hole in the top plate. Their fall due to gravity and their rise due to the electric field between the capacitor plates can be observed with the telescope. From measurements of the rise and fall times, the electric charge on a drop can be calculated. The charge on a drop could be changed by exposure to x rays from a source (not shown) mounted opposite the light source. (Continued) 12 More mg Buoyant force bv v ϭ 3-12 f b (see Figure 3-5). When an electric field Ᏹ is applied, the upward motion of a charge Droplet e qn is given by dv Weight mg q Ᏹ Ϫ mg Ϫ bv ϭ m n dt Fig. -
Millikan Oil Drop Experiment
Agenda 1. Measuring of the charge of electron. 2. Robert Millikan and his oil drop experiment 3. Theory of the experiment 4. Laboratory setup 5. Data analysis 2/17/2014 2 Measuring of the charge of the electron 1. Oil drop experiment. Robert A. Millikan.. (1909). e=1.5924(17)×10−19 C 2. Shot noise experiment. First proposed by Walter H. Schottky 3. In terms of the Avogadro constant and Faraday constant 풆 = 푭 ; F- Faraday constant, NA - Avagadro constant. Best 푵푨 uncertainty ~1.6 ppm. ퟐ풆 풉 4. From Josephson (푲 = ) and von Klitzing 푹 = constants 푱 풉 푲 풆ퟐ 5. Recommended by NIST value 1.602 176 565(35) 10-19 C 2/17/2014 3 Robert Millikan. Oil drop experiment The Nobel Prize in Physics 1923. Robert A. Millikan "for his work on the elementary charge of electricity and on the photoelectric effect". ROBERT ANDREWS MILLIKAN 1868-1953 22nd of March, 1868, Morrison, Ill University of Chicago 2/17/2014 4 Robert Millikan. Oil drop experiment ROBERT ANDREWS MILLIKAN 1868-1953 Diagram and picture of apparatus 2/17/2014 5 Oil drop experiment. Measurement of the magnitude of the electron charge! Motivation: Demonstrate that the electron charge is quantized! Measure the charge of an electron to ±3% Picture of the PASCO setup 2/17/2014 6 Oil drop experiment. atomizer Oil drops ∅~1m telescope + V Vg d 500V - 흆풂풊풓 Forces on the oil drop: 1) Gravity + buoyant force (air displaced by oil drop) 2) Drag force of the oil drop in the air 2/17/2014 7 Oil drop experiment. -
Anglican Catholicism Send This Fonn Or Call Us Toll Free at 1-800-211-2771
THE [IVING CHURCH AN INDEPENDENT WEEKLY SUPPORTING CATHOLIC ANGLICANISM • NOVEMBER 8 , 2009 • $2.50 Rome Welcomes Anglican Catholicism Send this fonn or call us toll free at 1-800-211-2771. I wish to give (check appropriate box and fill in) : My name: D ONE one-year gift subscription for $38.00 (reg. gift sub. $40.00) D TWO one-year gift subscriptions for $37 .00 each Name ------------''---------- Addres s __ _ __________ _ _____ _ ($37.00 X 2 = $74.00) THREE OR MORE one-year gift subscriptions for $36.00 each City/State/Zip ____ _ __________ _ _ _ D ($36.00 X __ = $._ _ ____, Phone _ __ ________________ _ Please check one: 0 One-time gift O Send renewal to me Email ____ _ ______________ _ Makechecks payable to : My gift is for: The living Church P.O.Box 514036 Milwaukee, WI 53203-3436 31.rec"-------------- Foo,ign postage extra First class rar,s available I VISA I~ ~ .,__· _c.· __________ _ D Please charge my credit card $ ____ _ ~ City/Stite/Zip __ _ _______ _ NOTE: PLEASE Fll.L IN CREDIT CARD BILLINGINFORMATION BELOW IF DIFFERENT FROM ADDRESS ABOVE. Phone Billing Address ________ _ _ _ _ _ ____ _ Bi.Bing City Please start this gift subscription O Dec. 20, 2009 Credit Card # _ _ _ _ _ __ _ _ Exp. Sign gift card _ _________ _ THELIVING CHURCH magazine is published by the Living Church Foundation, LIVINGCHURCH Inc. The historic mission of the Living Church Foundation is to promote and M independent weekly serving Episcopalians since1878 support Catholic Anglicanism within the Episcopal Church. -
1925:Red Equals Green
The Professional Football Researchers Association Red Equals Green 1925 By Bob Carroll In Joe Carr's Master Plan, the National Football League would rid independently since 1915 and were better prepared for the NFL itself of lesser municipalities like Evansville, Hammond, Green Bay, than any team in Boston, a city Carr might have preferred. even his own Columbus, and play exclusively in the nation's largest cities. He'd gained a Philadelphia team in 1924 (although Frankford Carr also brought Detroit back into the league under the actually played in a suburb). Chicago had the Bears and Cardinals. management of Jimmy Conzelman. Although it was never stated Cleveland was the league champ. It was time to get serious about officially, Conzelman apparently got a free ride on the guarantee New York. fee and did not even have to put up the $500 franchise fee. The situation had improved in Gotham. A new law on the books Something similar was done about Canton. The home of the made it legal to play pro football on Sundays. Carr approached original Bulldogs was not on Carr's "must" list, but it had promoter Billy Gibson, who'd had a stake in the 1921 Brickley sentimental support as well as some very vocal fans. A new team Giants. Gibson wasn't interested in going it alone, but he knew was set up to be run by some of the old Bulldog players. Wilbur someone who was, and he sent Carr to see Tim Mara, a New York Henry and Harry Robb came back from Pennsylvania, and Sam bookmaker. -
Millikan Oil Drop Experiment
(revised 1/23/02) MILLIKAN OIL-DROP EXPERIMENT Advanced Laboratory, Physics 407 University of Wisconsin Madison, Wisconsin 53706 Abstract The charge of the electron is measured using the classic technique of Millikan. Mea- surements are made of the rise and fall times of oil drops illuminated by light from a Helium{Neon laser. A radioactive source is used to enhance the probability that a given drop will change its charge during observation. The emphasis of the experiment is to make an accurate measurement with a full analysis of statistical and systematic errors. Introduction Robert A. Millikan performed a set of experiments which gave two important results: (1) Electric charge is quantized. All electric charges are integral multiples of a unique elementary charge e. (2) The elementary charge was measured and found to have the value e = 1:60 19 × 10− Coulombs. Of these two results, the first is the most significant since it makes an absolute assertion about the nature of matter. We now recognize e as the elementary charge carried by the electron and other elementary particles. More precise measurements have given the value 19 e = (1:60217733 0:00000049) 10− Coulombs ± × The electric charge carried by a particle may be calculated by measuring the force experienced by the particle in an electric field of known strength. Although it is relatively easy to produce a known electric field, the force exerted by such a field on a particle carrying only one or several excess electrons is very small. For example, 14 a field of 1000 volts per cm would exert a force of only 1:6 10− N on a particle × 12 bearing one excess electron.