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Dalam suatu mikroskop elektron, elektron akan dibe...

Dalam suatu mikroskop elektron, elektron akan diberi panjang gelombang sebesar begin mathsize 14px style 4 cross times 10 to the power of negative 2 end exponent space nm end style. Beda potensial yang dibutuhkan mikroskop tersebut adalah.... 

  1. 0,095 Vundefined 

  2. 0,950 Vundefined 

  3. 9,500 Vundefined 

  4. 950 Vundefined 

  5. 9.500 Vundefined 

Jawaban:

Kecepatan elektron:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row v equals cell fraction numerator h over denominator m lambda end fraction end cell row blank equals cell fraction numerator 6 comma 3 cross times 10 to the power of negative 34 end exponent over denominator 9 comma 1 cross times 10 to the power of negative 31 end exponent cross times 0 comma 04 cross times 10 to the power of negative 9 end exponent end fraction end cell row blank equals cell 18 comma 27 cross times 10 to the power of 6 space straight m divided by straight s end cell end table end style  

Perubahan energi listrik sama dengan perubahan energi kinetik:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E subscript l i s t r i k end subscript end cell equals cell E subscript k i n e t i k end subscript end cell row cell e increment V end cell equals cell 1 half m v squared end cell row cell increment V end cell equals cell fraction numerator m v squared over denominator 2 e end fraction end cell row cell increment V end cell equals cell fraction numerator open parentheses 9 comma 1 cross times 10 to the power of negative 31 end exponent close parentheses cross times open parentheses 18 comma 27 cross times 10 to the power of 6 close parentheses squared over denominator 2 cross times 1 comma 6 cross times 10 to the power of negative 19 end exponent end fraction end cell row cell increment V end cell almost equal to cell 950 space straight V end cell end table end style  

Jadi, jawaban yang benar adalah D

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