PASCO AP-8210A User Manual Download

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Millikan Oil Drop Apparatus

AP-8210A

Instruction Manual

012-13093B

012-13093B

Chamber Cover

Platform

Plate Charging

Switch

LED Light Source

Viewing Scope

Droplet Viewing

Chamber

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Summary of Contents for AP-8210A

Page 1: ...Millikan Oil Drop Apparatus AP 8210A Instruction Manual 012 13093B 012 13093B Chamber Cover Platform Plate Charging Switch LED Light Source Viewing Scope Droplet Viewing Chamber...

Page 2: ...age shows the PASCO AP 8210A Millikan Oil Drop Apparatus with a light emitting diode LED light source A power supply for the light source a bottle of non volatile oil and a spray atomizer are included...

Page 3: ...tron 11 Using a Projection Microscope with the Millikan Oil Drop Apparatus 12 Historical Information 13 Maintenance Notes Cleaning 17 Adjusting the Vertical Reticle and Viewing Scope Alignments 17 Adj...

Page 4: ...Millikan Oil Drop Apparatus iv 012 13093B...

Page 5: ...t charge then this is a good indication of the atomic nature of elec tricity However since a different droplet has been used for measuring each charge there remains the question as to the effect of th...

Page 6: ...wever becomes incorrect when the velocity of fall of the droplets is less than 0 1 cm s Droplets having this and smaller velocities have radii on the order of 2 microns comparable to the mean free pat...

Page 7: ...d by the droplet d separation of the plates in the droplet viewing chamber density of oil g acceleration of gravity viscosity of air b constant equal to 8 13 10 8 N m p barometric pressure a radius of...

Page 8: ...charging switch on the hook and loop tabs located on the top of the platform Included Equipment Part Number Millikan Oil Drop Apparatus AP 8210A AC Adapter 100 240 VAC to 12 VDC 1 0 A 540 092 Atomize...

Page 9: ...iode light source with a brightness adjustment knob focusing wire for adjusting the viewing scope plate voltage connectors 4 mm diameter plate charging switch Figure 4 Apparatus platform LED light sou...

Page 10: ...s plastic spacer approximately 7 6 mm thick lower capacitor plate brass alpha source thorium 232 0 00185 microcurie electrical connection to the upper capacitor plate Note Thorium 232 is a naturally o...

Page 11: ...s important to the degree of accuracy of your experimental results 3 Record the measurement Aligning the Optical System Focusing the viewing scope 1 Reassemble the plastic spacer and the upper capacit...

Page 12: ...om the thorium 232 3 At the Spray Droplet Position the chamber is vented by a small hole that allows air to escape when oil droplets are being introduced to the chamber Plate charging switch The plate...

Page 13: ...omizer is pointed down 90 to the shaft see Fig ure 9 Prepare the atomizer by rapidly squeezing the bulb until oil is spray ing out 3 Move the ionization source lever to the Spray Droplet Position to a...

Page 14: ...uence of an electric field 1000 V cm in the following times with the following charges NOTE If too many droplets are in view you can clear out many of them by turning the plate charging switch to TOP...

Page 15: ...u can 9 Record the plate potential the oil density the viscosity of the air at the temperature of the droplet viewing chamber see Appendix A and the barometric pressure for each set of velocity measur...

Page 16: ...m place a white paper screen in the droplet viewing chamber as illustrated in Figure 10 b Proceed with step 1 of Aligning the Optical System 2 Align and focus the projecting microscope a Set up the pr...

Page 17: ...e gram mole by electrolysis This quantity had been determined by Faraday to be 9650 absolute electromagnetic units of electric ity Using this method Stoney obtained a value of 0 3 x l0 10 e s u The Ki...

Page 18: ...ce of this telescope were placed three equally spaced cross hairs A small section of the space between the plates was illuminated by a narrow beam from an arc light the heat of the arc being absorbed...

Page 19: ...he same as the earlier pieces of apparatus attest to the effort expended in obtaining the most accurate evaluation of e possible The fol lowing passage is part of Millikan s description of the apparat...

Page 20: ...an insulator or conductor whether in electrolytes or in metals has a defi nite granular structure that it consists of an exact number of specks of electricity electrons all exactly alike which in stat...

Page 21: ...hole in the top capacitor plate the glass observation port covers on the housing and the droplet hole cover 2 The plastic spacer should be polished with a soft lint free cloth to remove any oil finge...

Page 22: ...into position by tightening the two socket head cap screws into the viewing scope holder Touching up the black painted surface on the plastic spacer After prolonged use and repeated cleaning the black...

Page 23: ...y Air as a Function of Temperature Nsm 2 x 10 5 1 8000 1 8040 1 8080 1 8120 1 8160 1 8200 1 8240 1 8280 1 8320 1 8360 1 8400 1 8440 1 8480 1 8520 1 8560 1 8600 1 8640 1 8680 1 8720 1 8760 1 8800 1 884...

Page 24: ...t Various Temperatures THERMISTOR RESISTANCE TABLE c 10 11 12 13 14 16 17 18 19 15 20 21 22 23 24 26 27 28 30 25 31 32 33 34 35 36 39 29 38 37 3 239 3 118 3 004 2 897 2 795 2 610 2 700 2 526 2 446 2 3...

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