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Страница 1: ...9641 Franck Hertz Oven Model SE 9642 Franck Hertz Control Unit 10101 FoothillsBlvd P 0 BOX 619011 Roseville CA 95661 USA 012 03498C 2 90 Franck Hertz Experiment SE 9641 Franck HertzOven withtube 0 C 5 1 SE 9640 Franck HertzTube SE 9642 Franck HertzControl Unit Copyright 0December 1989 5 00 I PASCOscientific ...
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Страница 3: ...IMITEDWARRANTY PASCO scientificwarrants this product to be f r e efrom defectsin materialsand workmanshipfora period of one year from the date of shipment to the customer PASCO will repair or replace at its option any part of the product I which is deemed to be defectivein material or workman ship This warranty does not cover damage t othe product causedby abuseor improperuse Determination of whet...
Страница 4: ...g equipmentfor repair the unitsmust be packed properly Carrierswill not acceptresponsibility for damagecausedby improperpacking Tobe certain the unit will not be damaged in shipment observe the following rules The carton must be strong enough for the item shipped Make certain there is at leasttwo inches of packing material between any point on the apparatusand the inside walls of the carton Make c...
Страница 5: ...les absorbenergy from the electronsonly at specificelectronenergies resonantenergies For example the first excitedstateof mercury is4 9 eV above the ground state This is the minimum amount of energy that the mercury atomscan absorbin collisionswith the acceleratedelectrons When Vais less than 4 9 V the electron moleculecollisions are therefore elastic so the electronsloose no energy to the gas and...
Страница 6: ...nit and an Oscilloscope Remove the six thumbscrewsthat securethe frontpanel of theFranck Hertz Oven Replace the front panel with the Franck Hertz Tubeas shown in Figure4 Insert a centigradethermometer 0 200degrees intothe hole in the top of the oven Insertit so the tipof the thermometeris near the centerof the tube Check the label and plug the oven intoan appropriate AC power outlet then turnthe t...
Страница 7: ... 15minutes Keepan eye on the thermometer Do not let the oven temperature exceed205 OC 4 Connect the tube control unit and voltmetersas shown in Figure4 theoscilloscopeconnectionsthat are shown in the figurearenot necessary when using voltmeters 5 Switchon the controlunit but only AFTER the tubehas been allowed to warmp up for 10 15minutes Initially set the controls as follows 6 7 8 9 Heater midran...
Страница 8: ...tage to zero volts and the opposingvoltage to 1 5 volts DONOT LETTHE HEATER VOLTAGE EXCEED7 VOLTS or the tubemay be damaged about 0 5 volts At each valueof Va record Vaand the correspondingvalue for the anode current I Repeat your measurements but this time try to locate the exact values of Vafor which currentminima occur Record these values of Vaand the correspondingvalues of I 18 SeeAnalyzing th...
Страница 9: ...imately 2 0eV This energy can be accounted for by subtracting 2 0 volts from the measured values of Va at which I is a minimum for a adjusted v a Voltage difference betweenadjacent minima a adjusted 2 3 4 Ifyou did not use the oscilloscopeto make your measurements plot a graph ofplate current versus plate currentminima andrecord the corresponding You should find that the currentminima are spaced a...
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Страница 11: ...ethefollowinginformation If yourproblem iscomputer softwarerelated note Title andRevision Dateof software Type of Computer Make Model Speed Type of externalCables Peripherals If your problem is w i t hthePASCO apparatus note TitleandModelnumber usually listedon the label Approximateage of apparatus A detailed description of theprobled sequence of events Incaseyou can tcallPASCOrightaway you won t ...
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