Roboguru

Cahaya Matahari mencapai Bumi setelah menempuh jarak rata-rata dengan laju pada permukaan yang tegak lurus arah cahaya. Anggaplah cahaya Matahari monokromatis dengan frekuensi . Berapa banyak foton

Cahaya Matahari mencapai Bumi setelah menempuh jarak rata-rata begin mathsize 14px style 1 comma 5 cross times 10 to the power of 11 space straight m end style dengan laju begin mathsize 14px style 1 comma 4 cross times 10 cubed space straight W divided by straight m squared end style pada permukaan yang tegak lurus arah cahaya. Anggaplah cahaya Matahari monokromatis dengan frekuensi begin mathsize 14px style 5 cross times 10 to the power of 14 space Hz end style. Berapa banyak foton per meter kubik di dekat permukaan Bumi?

Jawaban:

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Ditanyakan: banyak foton per meter kubik di dekat permukaan Bumi?
Jawab:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row I equals cell P over A end cell row I equals cell fraction numerator begin display style fraction numerator E n e r g i over denominator t end fraction end style over denominator A end fraction end cell row I equals cell fraction numerator n h f over denominator A. t end fraction end cell row cell n over A end cell equals cell fraction numerator I. t over denominator h f end fraction. fraction numerator 1 over denominator 2 r end fraction end cell row cell fraction numerator n over denominator A.2 r end fraction end cell equals cell fraction numerator 1 comma 4 cross times 10 cubed open parentheses 1 close parentheses over denominator left parenthesis 6 comma 63 cross times 10 to the power of negative 34 end exponent right parenthesis left parenthesis 5 cross times 10 to the power of 14 right parenthesis end fraction. fraction numerator 1 over denominator 2 open parentheses 1 comma 5 cross times 10 to the power of 11 close parentheses end fraction end cell row cell fraction numerator n over denominator A.2 r end fraction end cell equals cell fraction numerator 1 comma 4 cross times 10 cubed over denominator 99 comma 45 cross times 10 to the power of negative 9 end exponent end fraction end cell row cell fraction numerator n over denominator A.2 r end fraction end cell equals cell 0 comma 0141 cross times 10 to the power of 12 end cell row cell fraction numerator n over denominator A.2 r end fraction end cell equals cell 1 comma 41 cross times 10 to the power of 10 space foton divided by straight m cubed end cell end table end style 

Jadi,  banyak foton per meter kubik di dekat permukaan Bumi sebesar begin mathsize 14px style bold 1 bold comma bold 41 bold cross times bold 10 to the power of bold 10 bold space bold italic f bold italic o bold italic t bold italic o bold italic n bold divided by bold m to the power of bold 3 end style.

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