Roboguru

Suatu permukaan natrium disinari cahaya dengan panjang gelombang 300 nm. Fungsi kerja logam natrium adalah 2,46 eV. Tentukan energi kinetik maksimum elektron-elektron foto yang dikeluarkan.

Pertanyaan

Suatu permukaan natrium disinari cahaya dengan panjang gelombang 300 nm. Fungsi kerja logam natrium adalah 2,46 eV. Tentukan energi kinetik maksimum elektron-elektron foto yang dikeluarkan.undefined

Pembahasan Soal:

Diketahui :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E subscript o end cell equals cell 2 comma 46 space eV end cell row blank equals cell 2 comma 46 cross times 1 comma 602 cross times 10 to the power of negative 19 end exponent space joule end cell row blank equals cell 3 comma 94 cross times 10 to the power of negative 19 end exponent space joule end cell row lambda equals cell 300 space nm end cell row blank equals cell 300 cross times 10 to the power of negative 9 end exponent space straight m end cell row h equals cell 6 comma 63 cross times 10 to the power of negative 34 end exponent space Js end cell row c equals cell 3 cross times 10 to the power of 8 space straight m divided by straight s end cell end table end style 

Ditanya :

EK = ....?

Jawab :

Untuk menyelesaikan soal ini, kita gunakan rumus efek fotolistrik :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell E K end cell equals cell E minus E subscript o end cell row cell E K end cell equals cell fraction numerator h c over denominator lambda end fraction minus E subscript o 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 300 cross times 10 to the power of negative 9 end exponent end fraction minus 3 comma 94 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 10 to the power of negative 34 end exponent cross times 3 cross times 10 to the power of 8 over denominator 3 cross times 10 to the power of negative 7 end exponent end fraction minus 3 comma 94 cross times 10 to the power of negative 19 end exponent end cell row cell E K end cell equals cell 6 comma 63 cross times 10 to the power of negative 19 end exponent minus 3 comma 94 cross times 10 to the power of negative 19 end exponent end cell row cell E K end cell equals cell 2 comma 69 cross times 10 to the power of negative 19 end exponent space joule end cell end table end style 

Jadi, energi kinetiknya  begin mathsize 14px style bold 2 bold comma bold 69 bold cross times bold 10 to the power of bold minus bold 19 end exponent bold space bold joule end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 13 Maret 2021

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