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Intensitas bunyi di titik A yang berjarak 1 meter ...

Intensitas bunyi di titik A yang berjarak 1 meter dari sumber bunyi adalah begin mathsize 14px style 10 to the power of negative 7 end exponent space straight W divided by straight m squared end style. Titik B berjarak 100 m dari sumber bunyi. Jika intensitas ambang begin mathsize 14px style 10 to the power of negative 12 end exponent space straight W divided by straight m squared end style, maka perbandingan taraf intensitas di A dan B adalah …space 

  1. 5 : 3undefined 

  2. 5 : 1undefined 

  3. 4 : 5undefined 

  4. 4 : 3undefined 

  5. 3 : 1space 

Jawaban:

Diketahui:

begin mathsize 14px style I subscript A equals 10 to the power of negative 7 end exponent space straight W divided by straight m squared R subscript A equals 1 space straight m R subscript B equals 100 space straight m I subscript 0 equals 10 to the power of negative 12 end exponent space straight W divided by straight m squared  fraction numerator T I subscript A over denominator T I subscript B end fraction equals fraction numerator 10 space log open parentheses begin display style I subscript A over I subscript 0 end style close parentheses over denominator 10 space log open parentheses I subscript A over I subscript 0 close parentheses plus 20 log open parentheses begin display style R subscript A over R subscript B end style close parentheses end fraction fraction numerator T I subscript A over denominator T I subscript B end fraction equals fraction numerator 10 space log open parentheses begin display style 10 to the power of negative 7 end exponent over 10 to the power of negative 12 end exponent end style close parentheses over denominator 10 space log open parentheses 10 to the power of negative 7 end exponent over 10 to the power of negative 12 end exponent close parentheses plus 20 log open parentheses begin display style 1 over 100 end style close parentheses end fraction fraction numerator bold T bold I subscript bold A over denominator bold T bold I subscript bold B end fraction bold equals bold 5 over bold 1 end style

Jadi, jawaban yang tepat adalah Bundefined 

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