Roboguru

Suatu sumber cahaya tertentu meradiasikan kalor dengan puncaknya memiliki frekuensi  Hz. Tentukan suhu sumber cahaya.

Pertanyaan

Suatu sumber cahaya tertentu meradiasikan kalor dengan puncaknya memiliki frekuensi begin mathsize 14px style 1 comma 5 space x space 10 to the power of 14 end style Hz. Tentukan suhu sumber cahaya.

Pembahasan Soal:

Berdasarkan hukum pergeseran Wien :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell lambda subscript m a k s end subscript T end cell equals cell 2 comma 9 space x space 10 to the power of negative 3 end exponent space mK end cell row T equals cell fraction numerator 2 comma 9 space x space 10 to the power of negative 3 end exponent over denominator lambda subscript m a k s end subscript end fraction end cell end table end style 

berdasarkan hubungan begin mathsize 14px style lambda equals v over f equals c over f end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row T equals cell fraction numerator 2 comma 9 space x space 10 to the power of negative 3 end exponent over denominator begin display style c over f end style end fraction end cell row T equals cell fraction numerator 2 comma 9 space x space 10 to the power of negative 3 end exponent over denominator c end fraction x space f end cell end table end style 

Dengan begin mathsize 14px style c equals 3 cross times 10 to the power of 8 space straight m divided by straight s end style dan begin mathsize 14px style f equals 1 comma 5 cross times 10 to the power of 14 space Hz end style, maka T :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row T equals cell fraction numerator 2 comma 9 cross times 10 to the power of negative 3 end exponent cross times 1 comma 5 cross times 10 to the power of 14 over denominator 3 cross times 10 to the power of 8 end fraction end cell row T equals cell 1 comma 45 cross times 10 cubed space straight K end cell row T equals cell 1450 space straight K end cell row T equals cell 1177 degree straight C end cell end table end style 

Jadi, suhu sumber cahaya adalah begin mathsize 14px style bold 1177 bold degree bold C end style.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 19 Mei 2021

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