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Fungsi kerja logam Na adalah 2,1 eV. Berapa kelajuan maksimum elektron foto yang dipancarkan oleh cahaya dengan panjang gelombang 5600Å?

Fungsi kerja logam Na adalah 2,1 eV. Berapa kelajuan maksimum elektron foto yang dipancarkan oleh cahaya dengan panjang gelombang 5600 Å?

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Y. Maghfirah

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Jawaban terverifikasi

Jawaban

kelajuan maksimum elektron foto adalah .

kelajuan maksimum elektron foto adalah bold 0 bold comma bold 2 bold cross times bold 10 to the power of bold 6 bold space bold m bold divided by bold s.

Pembahasan

Pembahasan
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Diketahui : Ditanya : v = ....? Jawab : Jadi, kelajuan maksimum elektron foto adalah .

Diketahui :

E subscript o equals 2 comma 1 space eV equals 2 comma 1 cross times 1 comma 6 cross times 10 to the power of negative 19 end exponent space straight J lambda equals 5600 space straight Å equals 5600 cross times 10 to the power of negative 10 end exponent space straight m  

Ditanya :

v = ....?

Jawab :

 table attributes columnalign right center left columnspacing 0px end attributes row cell E K end cell equals cell E minus E subscript 0 space end cell row cell E K end cell equals cell fraction numerator h c over denominator lambda end fraction minus E blank subscript 0 space end cell row cell E K end cell equals cell fraction numerator 6 comma 63 cross times 10 to the power of negative 34 end exponent cross times 3 cross times 10 to the power of 8 over denominator 5600 cross times 10 to the power of negative 10 end exponent end fraction minus 2 comma 1 cross times 1 comma 6 cross times 10 to the power of negative 19 end exponent end cell row cell E K end cell equals cell fraction numerator 6 comma 63 cross times 3 cross times 10 to the power of negative 16 end exponent over denominator 5600 end fraction minus 2 comma 1 cross times 1 comma 6 cross times 10 to the power of negative 19 end exponent end cell row cell E K end cell equals cell 0 comma 00355 cross times 10 to the power of negative 16 end exponent minus 3 comma 36 cross times 10 to the power of negative 19 end exponent end cell row cell E K end cell equals cell 3 comma 55 cross times 10 to the power of negative 19 end exponent minus 3 comma 36 cross times 10 blank to the power of negative 19 end exponent end cell row cell E K end cell equals cell 0 comma 19 cross times 10 to the power of negative 19 end exponent end cell row cell 1 half m v squared end cell equals cell 0 comma 19 cross times 10 to the power of negative 19 end exponent end cell row cell v squared end cell equals cell fraction numerator 2 open parentheses 0 comma 19 cross times 10 to the power of negative 19 end exponent close parentheses over denominator m end fraction end cell row cell v squared end cell equals cell fraction numerator 2 open parentheses 0 comma 19 cross times 10 to the power of negative 19 end exponent close parentheses over denominator 9 comma 1 cross times 10 to the power of negative 31 end exponent end fraction end cell row v equals cell square root of 0 comma 042 cross times 10 to the power of 12 end root end cell row blank equals cell 0 comma 2 cross times 10 to the power of 6 space straight m divided by straight s end cell end table   

Jadi, kelajuan maksimum elektron foto adalah bold 0 bold comma bold 2 bold cross times bold 10 to the power of bold 6 bold space bold m bold divided by bold s.

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