1. What is the intensity of a sound when an observer is 10.0 m from the speaker that has power of 200. W?

Question

1. What is the intensity of a sound when an observer is 10.0 m from the speaker

that has power of 200. W?

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Phúc Điền 5 years 2021-07-18T21:25:36+00:00 1 Answers 27 views 0

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  1. thanhcong
    0
    2021-07-18T21:26:38+00:00
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    Answer:

    About 133 db.

    Explanation:

    Sound Intensity Level in db (SIL db) is equal to 10log (base 10) times the ratio of the sound intensity at 200 watts (I) relative to the sound intensity of  the reference sound intensity (I sub 0), which by default is equal to 10⁻¹² W/m² or 0 dB.

    I = 200 w / 10 m^2 = 20 w per square meter  

    I sub 0 = 10^-12 w per square meter

    SIL = 10log ( I / I sub o) = 20 / 10^-12 = 10log ( 20^12) = 10 ( 13.3 ) = 133 db

    Hope I typed this part correctly. Hard to get it in without being able to do exponents, etc. 😀

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