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lntensitas cahaya Matahari di permukaan Bumi kira-...

lntensitas cahaya Matahari di permukaan Bumi kira-kira begin mathsize 14px style 1.400 space straight W divided by straight m squared end style. Dengan menganggap energi foton rata-rata begin mathsize 14px style 2 space eV end style (yang bersesuaian dengan panjang gelombang begin mathsize 14px style 600 space nm end style), hitunglah jumlah foton yang mengenai luas begin mathsize 14px style 1 space cm squared end style selama 1 detik!

Jawaban:

begin mathsize 14px style I equals 1.400 space straight W divided by straight m squared E equals 2 space eV 1 space e V equals space 1 comma 6 cross times 10 to the power of negative 19 end exponent space straight J lambda equals 600 space nm equals 600 cross times 10 to the power of negative 9 end exponent space straight m A equals 1 space cm squared equals 10 to the power of negative 4 end exponent space straight m squared t equals 1 space detik end style 

Ditanyakan: jumlah foton?
Jawab:

begin mathsize 14px style I equals P over A I equals fraction numerator E over denominator A. t end fraction I equals fraction numerator n h f over denominator A. t end fraction I equals fraction numerator n h c over denominator A t lambda end fraction n equals fraction numerator I A t lambda over denominator h c end fraction n equals fraction numerator open parentheses 1400 close parentheses open parentheses 10 to the power of negative 4 end exponent close parentheses open parentheses 1 close parentheses open parentheses 600 cross times 10 to the power of negative 9 end exponent close parentheses over denominator open parentheses 6 comma 63 cross times 10 to the power of negative 34 end exponent close parentheses open parentheses 3 cross times 10 to the power of 8 close parentheses end fraction n equals fraction numerator 84 cross times 10 to the power of negative 9 end exponent over denominator 19 comma 89 cross times 10 to the power of negative 26 end exponent end fraction n equals 4 comma 22 cross times 10 to the power of 17 space foton end style 

Jadi, jumlah foton yang mengenai permukaan sebesar begin mathsize 14px style bold 4 bold comma bold 22 bold cross times bold 10 to the power of bold 17 bold space bold foton end style.

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