chapter 14
chapter 14
chapter 14
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Gas Discharge Tube+ --+-- + --++Showed matter was made up ofcharged piecesnegative particles are identicalsmall mass; electronspositive particles differ depending on gaslarge masseven small differences with same gas+What were the positive particles?A. ProtonsB. NucleiC. Atoms missing a few electrons13<strong>14</strong>Thomson Model of Atom(Plum Pudding Model)Atoms consist of a thin positive fluid, which containsmost of the mass, with embedded point-likenegative electrons to balance the chargePositive goopNegative particles15Two more experimentsThe ‘Milikan’ oil drop experimentShowed that charge is ‘quantized’ (a bigword meaning it comes in certain sizedlumps)Mass spectrometersShow that mass is ‘quantized’Time-of-Flight Mass Spectrometerpulse accelerator platespositiveparticlessame kinetic energy+ -Length of flight pathdetectorkinetic energy = 1/2 (mass)(speed) 2Heaviest particles move slowest1718
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