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anonymous

  • 5 years ago

Let i0=1.0*10^-12 watt per square meter be the energy intensity of the softest sound detectable by the human ear. Let L(i)=10*log(i/i0) be the formula for the loudness of a sound, in decibels(dB), whose energy intensity is i. Find the decibel measure of the sound whose energy intensity is 8*10^-4 watt per square meter. A.80.0 dB B.89.0 dB C.98.0 dB D.107.0 dB E.116.0 dB

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  1. anonymous
    • 5 years ago
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    B

  2. anonymous
    • 5 years ago
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    Can I ask how you found that?

  3. anonymous
    • 5 years ago
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    L= 10log (i/i0) i = 8 * 10^-4 i/i0 = 8*10^8

  4. anonymous
    • 5 years ago
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    right

  5. anonymous
    • 5 years ago
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    log (8*10^8) = log 8 + log 10^8 = 0.903 + 8

  6. anonymous
    • 5 years ago
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    that into ten is 89

  7. anonymous
    • 5 years ago
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    got it?

  8. anonymous
    • 5 years ago
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    yes thank you!

  9. anonymous
    • 5 years ago
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    ne more?

  10. anonymous
    • 5 years ago
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    Find the logarithm without using a calculator: log (radical) 100000000000 =

  11. anonymous
    • 5 years ago
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    wts radical?

  12. anonymous
    • 5 years ago
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    if its log to the base 10 then count the no of zeros and thats d answer

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