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class18 - Results of the Photoelectric Eect Experiemnt 1...

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Results’of’the’Photoelectric’EFect’ Experiemnt 1’There’is’minimum’frequency’below’which’light’won±t’kick’out’ electrons.’ (Need’a’certain’amount’of’energy’to’free’electron’from’metal) 2’If’light’can’kick’out’electron,’then’even’smallest’intensiHes’of’that’light’ will’conHnue’to’kick’out’electrons.’KE’of’electrons’does’not’depend’on’ intensity.’ (Light’energy’must’be’ge²ng’concentrated/focused’somehow) 3’ Lower’frequencies’of’light’means’lower’iniHal’KE’of’electrons’ ’&’KE’changes’linearly’with’frequency.’ (This’concentrated’energy’is’linearly’related’to’frequency)’ (Einstein) Need’“photon”’picture’of’light’to’explain’observaHons:’ -’Light’comes’in’chunks’(“parHcle-like”)’of’energy’(“photon”)’ -’a’photon’interacts’only’with’single’electron’ -’Photon’energy’depends’on’frequency’of’light,’…’ for’lower’frequencies,’photon’energy’not’enough’to’free’an’electron’ quesHons?,’more’sim’experiments?’
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Kicker’analogy:’a’ball’in’a’pit Light’like’a’Kicker…’ Puts’in’energy.’All’concentrated’ on’one’ball/electron.’ Blue’kicker’always’kicks’the’same, KE = kick energy - mgh Ball’emerges’with:’ mgh’=’energy’needed’to’ make’it’up’hill’and’out.’ mgh’for’highest’electron’ analogous’to’work’funcHon.’ Kick’energy.’Top’ones’ get’out,’boXom’don±t.’ ²arder’kick’(shorter’ wavelength’light),’ ’more’get’out.’ h’ metal’ electrons’ and’harder than’ red’kicker’ always’kicks.’
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Light’like’a’Kicker…’ Puts’in’energy.’All’concentrated’
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class18 - Results of the Photoelectric Eect Experiemnt 1...

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