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Pertanyaan

Panjang gelombang suatu foton begin mathsize 14px style 5 space cross times space 10 cubed space straight Å space end style mengenai suatu permukaan logam yang energi-ambangnya begin mathsize 14px style 2 space eV end style . Jika begin mathsize 14px style c space equals space 3 space cross times space 10 to the power of 8 space straight m divided by straight s end style  dan begin mathsize 14px style h space equals space 6 comma 63 space x space 10 to the power of negative 34 end exponent space Js end style , besar energi kinetik elektron foto adalah (begin mathsize 14px style 1 space e V space equals 1 comma 6 space straight X space 10 to the power of negative 19 end exponent space straight J end style ) ... 

  1. begin mathsize 14px style 6 comma 78 space cross times space 10 to the power of 20 space straight J space end style 

  2. 6 comma 87 space cross times space 10 to the power of 20 space straight J space 

  3. 7 comma 78 space cross times space 10 to the power of 20 space straight J space 

  4. 8 comma 68 space cross times space 10 to the power of 20 space straight J space 

  5. 9 space cross times space 10 to the power of 20 space straight J space 

Y. Maghfirah

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C

Pembahasan

E K equals E minus E subscript o E K equals h c over lambda minus E subscript o E K equals 6 comma 6 cross times 10 to the power of negative 34 end exponent space fraction numerator 3 cross times 10 to the power of 8 over denominator 5 cross times 10 to the power of negative 7 end exponent end fraction minus 2 space eV E K equals 6 comma 6 cross times 10 to the power of negative 34 end exponent space fraction numerator 3 cross times 10 to the power of 8 over denominator 5 cross times 10 to the power of negative 7 end exponent end fraction minus 2 space eV space cross times space 1 comma 6 cross times 10 to the power of negative 19 end exponent E K equals 3 comma 96 cross times 10 to the power of negative 19 end exponent space minus space 3 comma 2 cross times 10 to the power of negative 19 end exponent E K equals 0 comma 76 cross times 10 to the power of negative 19 end exponent space straight J EK equals 7 comma 6 cross times 10 to the power of negative 20 end exponent space straight J EK almost equal to 7 comma 78 cross times 10 to the power of negative 20 end exponent space straight J    

Jadi, jawaban yang benar adalah C

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