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Frekuensi ambang dari sebuah logam yakni . Ketika ...

Frekuensi ambang dari sebuah logam yakni begin mathsize 14px style 4 cross times 10 to the power of 14 space Hz end style. Ketika logam dijatuhi foton, ternyata elektronnya memiliki energi kinetic sebesar begin mathsize 14px style 19 comma 86 cross times 10 to the power of negative 20 end exponent space straight J end style. Maka berapakah frekuensi foton bila begin mathsize 14px style h equals 6 comma 62 cross times 10 to the power of negative 34 end exponent space Js end style

  1. (...) 

  2. (...) 

Jawaban:

Diketahui:
begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f subscript o end cell equals cell 4 cross times 10 to the power of 14 space Hz end cell row cell E subscript k end cell equals cell 19 cross times 10 to the power of negative 20 end exponent space straight J end cell row h equals cell 6 comma 62 cross times 10 minus 34 space Js end cell row blank blank blank end table end style 

Ditanya:
begin mathsize 14px style f subscript 1 equals ? end style 

Jawab

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell w subscript o end cell equals cell h times f subscript o end cell row blank equals cell 6 comma 62 cross times 10 to the power of negative 34 end exponent times 4 cross times 10 to the power of 14 end cell row blank equals cell 26 comma 48 cross times 10 to the power of negative 20 end exponent J end cell row blank blank blank row E equals cell E subscript k plus w subscript o end cell row cell h times f subscript 1 end cell equals cell E subscript k plus w subscript o end cell row cell f subscript 1 end cell equals cell fraction numerator E subscript k plus w subscript o over denominator h end fraction end cell row blank equals cell fraction numerator 19 comma 86 cross times 10 to the power of negative 20 end exponent plus 26 comma 48 cross times 10 to the power of 20 over denominator 6 comma 62 cross times 10 to the power of negative 34 end exponent end fraction end cell row blank equals cell 7 cross times 10 to the power of 14 space Hz end cell end table end style 

Jadi, frekuensi foton adalah begin mathsize 14px style 7 cross times 10 to the power of 14 space Hz end style

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