Millikan.ppt
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Transcript of Millikan.ppt
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PERCOBAAN TETES MINYAK MILLIKAN
Erus Rustami
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TUJUAN
Menentukan muatan tetesan minyak
Mengamati sifat diskrit muatan (kuantisasi
muatan) pada tetesan minyak
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OUTLINE
Sejarah
Peralatan
Metode Teori dan perhitungan
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SEJARAH
JJ Thomson(1856–1940) dapat menghitungrasio muatan/ masa (e/m) elektron:
1.76 x 1011 C/kg
Berapa nilai massa dan
muatannya?
Robert Andrews Millikan (1868-1953
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IDE…
!"#e basi$ idea is to $#ar%e oil drops wit#
ele$trons and t#en apply an ele$tri$ &ield to
stop t#em &rom &allin%' rom t#e balance
o& gravity and applied electric field) t#e
$#ar%e on t#e ele$tron was determined*'
Robert Andrews Millikan) dkk (19+9 M
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PERALATAN
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PERALATAN
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PERALATAN
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PERALATAN
Ionisasi udara sebagai sumber elektron
merupakan hasil dari pemancaran gelombang
alpha dari thorium-232
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SETUP PERALATAN
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METODE
Menghitung kecepatan terminal.
Menghitung kecepatan naik dengan nilai
tegangan tertentu.
Menghitung nilai radius atau jari-jari droplet Menghitung massa droplet
Menentukan muatan yang menempel di droplet
akibat ionisasi
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1' Minyak disemprotkan ke dalam #ole
,' Amati satu droplet dan #itun% ke$epatannya
3' enyebab %erak #anya %ra.itasi'
1.MENGHITUNG KECEPATAN TERMINAL
/kuran Ma0or reti$le lines (+'5 mm
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MENGHITUNG RADIUS
MENGHITUNG MASSA
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Beda potensial diberikan ke pelat mun$ul %aya pelawan
ettin% ke ionisasi sekitar 5 detik
MENGHITUNG KECEPATAN NAIK
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"op plate $ukup positi& se#in%%a muatan ne%ati& ber%erak
ke atas) #itun% ke$epatan %erak ke atas'
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MENGHITUNG NILAI MUATAN
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Beda potensial diad0ust sampai partikel diam (men%amban%
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TEKNIK LAIN MENGHITUNG MUATAN
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2 Medan listrik di#itun% dari beda potensial diantara dua pelat ( 4
d
2 7ilai ke$epatan terminal di%unakan untuk men%#itun%) mg 2 Men%%unakan dan m% maka dapat di#itun%
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E*q = m*g
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oplet memiliki muatan yan% diskrit (bulat' eruba#an
muatan tersebut selalu kelipatan dari -1'6 : 1+-19 ;'
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TERIMA KASIH