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Sebuah foton memiliki panjang gelombang 40 Å menum...

Sebuah foton memiliki panjang gelombang 40 Å menumbuk sebuah elektron dan arah foton menyimpang 60° dari semula. Tentukan energi kinetik elektron setelah tumbukan!space 

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Jawaban:

Diketahui :

undefinedbegin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row lambda equals cell 40 space text A end text equals 4 cross times 10 to the power of negative 9 end exponent space text m end text end cell row alpha equals cell 60 degree end cell row h equals cell 6 comma 625 cross times 10 to the power of negative 34 end exponent space text Js end text end cell row cell m subscript o end cell equals cell 9 comma 1 cross times 10 to the power of negative 31 end exponent space text kg end text end cell row c equals cell 3 cross times 10 to the power of 8 space text m/s end text end cell end table end style 

Ditanya :

Energi kinetik foton setelah tumbukan?

Penyelesaian :

Mencari panjang gelombang foton setelah tumbukan
begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell lambda apostrophe minus lambda end cell equals cell fraction numerator h over denominator m subscript o c end fraction left parenthesis 1 minus c o s alpha right parenthesis end cell row cell lambda apostrophe minus left parenthesis 4 cross times 10 to the power of negative 9 end exponent right parenthesis end cell equals cell fraction numerator 6 comma 625 cross times 10 to the power of negative 34 end exponent over denominator left parenthesis 9 comma 1 cross times 10 to the power of negative 31 end exponent right parenthesis left parenthesis 3 cross times 10 to the power of 8 right parenthesis end fraction left parenthesis 1 minus c o s space 60 degree right parenthesis end cell row cell lambda apostrophe end cell equals cell left parenthesis 4 cross times 10 to the power of negative 9 end exponent right parenthesis plus fraction numerator 6 comma 625 cross times 10 to the power of negative 34 end exponent over denominator left parenthesis 9 comma 1 cross times 10 to the power of negative 31 end exponent right parenthesis left parenthesis 3 cross times 10 to the power of 8 right parenthesis end fraction left parenthesis 1 minus 1 half right parenthesis end cell row blank equals cell left parenthesis 4 cross times 10 to the power of negative 9 end exponent right parenthesis plus left parenthesis 0 comma 00121 cross times 10 to the power of negative 9 end exponent right parenthesis end cell row blank equals cell 4 comma 00121 cross times 10 to the power of negative 9 end exponent space straight m end cell end table end style 

Energi kinetik foton setelah tumbukan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E subscript k end cell equals cell h f minus h f apostrophe end cell row blank equals cell fraction numerator h c over denominator lambda end fraction minus fraction numerator h c over denominator lambda apostrophe end fraction end cell row blank equals cell h c left parenthesis 1 over lambda minus fraction numerator 1 over denominator lambda apostrophe end fraction right parenthesis end cell row blank equals cell h c left parenthesis fraction numerator 1 over denominator 4 cross times 10 to the power of negative 9 end exponent end fraction minus fraction numerator 1 over denominator 4 comma 00121 cross times 10 to the power of negative 9 end exponent end fraction right parenthesis end cell row blank equals cell h c left parenthesis 2 comma 5 cross times 10 to the power of 8 minus 2 comma 499 cross times 10 to the power of 8 right parenthesis end cell row blank equals cell 6 comma 625 cross times 10 to the power of negative 34 end exponent cross times 3 cross times 10 to the power of 8 cross times 0 comma 001 cross times 10 to the power of 8 end cell row blank equals cell 0 comma 01987 cross times 10 to the power of negative 18 end exponent end cell row blank equals cell 1 comma 987 cross times 10 to the power of negative 20 end exponent space straight J end cell end table end style 

Jadi, besar energi kinetik foton setelah tumbukan adalah begin mathsize 14px style bold 1 bold comma bold 987 bold cross times bold 10 to the power of bold minus bold 20 end exponent end styleJ.

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