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Fungsi kerja wolfram adalah 4,58 eV. Carilah poten...

Fungsi kerja wolfram adalah 4,58 eV. Carilah potensial hentinya jika panjang gelombang cahaya yang datang sama dengan 250 nm!undefined 

Jawaban:

begin mathsize 14px style W subscript 0 equals 4 comma 58 space eV 1 space e V equals 1 comma 6 cross times 10 to the power of negative 19 end exponent space straight J lambda equals 250 space nm equals 2 comma 5 cross times 10 to the power of negative 7 end exponent space straight m end style 

Ditanyakan: besar potensial hentinya?
Jawab:

begin mathsize 14px style E k equals q. V subscript s V subscript s equals fraction numerator E k over denominator q end fraction V subscript s equals fraction numerator h begin display style c over lambda end style minus W subscript 0 over denominator q end fraction V subscript s equals fraction numerator left parenthesis 6 comma 63 cross times 10 to the power of negative 34 end exponent right parenthesis begin display style fraction numerator open parentheses 3 cross times 10 to the power of 8 close parentheses over denominator 2 comma 5 cross times 10 to the power of negative 7 end exponent end fraction end style minus left parenthesis 4 comma 58 right parenthesis left parenthesis 1 comma 6 cross times 10 to the power of negative 19 end exponent right parenthesis over denominator 1 comma 6 cross times 10 to the power of negative 19 end exponent end fraction V subscript s equals fraction numerator 0 comma 628 cross times 10 to the power of negative 19 end exponent over denominator 1 comma 6 cross times 10 to the power of negative 19 end exponent end fraction V subscript s equals 0 comma 39 space straight V end style 

Jadi, besar potensial hentinya adalah 0,39 V.

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