2425 CA -Common Core int.
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n Cere Int. Man min 52
Unit Test
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The loubress, \( L \), measured in decibets (Db), of a sound intensity, I, measured in watts per square meter, is defined as \( L=10 \log _{8} \frac{1}{L_{4}} \), where \( t_{8}=10^{-12} \) and is the least intense sound a human ear can hear. Jessica is listening to soft music at a sound ixtensty level of \( 10^{9} \) on her computer while she does her homework. Braylee is completing her homework while Istering to very loud music at a sound intensity level of \( 10^{-3} \) on her headphones. How many times louder is Braylee's music than Jessica's?
\( \frac{1}{3} \) times louder
3 tmes buoder
30 trives louder
90 times louder
Mablinumbtum
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