posted by .

I have posted this question earlier as well but was unable to receive an answer. I don't know how to do this question at all, so PLEASE help me with this question and also show me the steps, so that I can learn. I would appreciate it a lot.

A high sound level of 120 dB is regarded as the threshold of pain for the average listener. If the threshold of hearing is 10^−12 watts/m^2, then the intensity of the sound corresponding to 120 dB is
_________ watts/m^2.

  • Precalculus -

    You must be referring to

    Using bobpursley's formul, he is very seldom wrong,
    and my 10 digit display calculator, I got

    10log(120/10^-12) as

    130.79 or 131 decibels.

  • Precalculus -

    No unfortunately this is not the correct answer :(, is there any other way of doing this question?

  • Precalculus -

    Does the formula use natural logs perhaps (ln) ?

    Was there a formula or relation given?
    By how much is our answer off ?

  • Precalculus -

    This is an online assignment, we write the answer and the computer system recognizes whether the answer is right or wrong, but doesn't give any hint.
    See if this helps:
    The instructor gave us the formula 10log E/E0 and this
    question told us what EO is so we just plugged it in then
    we got rid of the 10 in front of the log by making it equal
    to 12 instead of 120.....Someone already gave the equation
    to solve earlier in the discussion Consider log(E/10^-12)=12

    just solve for E we know that 10^12 = (E/10^-12) as this is
    a log of common base ten then from here you solve for E

    we also know that 10^-12 is also 1/10^12

    hope these hints help

  • Precalculus -

    Ok then, if we are just solving

    120 = 10log(E/10^-12) then it is easy

    divide both sides by 10
    12 = log(E(10^12))
    which means e(10^12) = 10^12
    E = 1

    try that

  • Precalculus -

    Yes, 1 is the answer. Thanks a lot for your help Reiny :)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. try

    I guess my question that I posted does not come up I would like to answer your question, but I am unaware of your previous post. Please repost with the question. Thanks for asking.
  2. calorimetry

    please, someone answer my question i posted already I answered your question within 15 minutes. It is posted. Hit the refresh button of your computer. sorry that my question took youthat long, but it was of great help. glad to help. …
  3. chemistry

    Predict the precipitate that forms: HCl + AgNO3 --> ?
  4. Social studies?

    Please ignore my previous post. I prematurely hit the enter key. I've been watching this board all day, waiting for someone to answer my physics question (no one has yet. sigh.) I just have to say Ms. Sue is my hero. She consistently …
  5. algebra 1

    Reiny I posted a question earlier (about 3:00) and I have a question about your solution. How did you get -4x?
  6. Chemistry

    Hi DrBob, thanks for getting back to me on the earlier related question, but to be honest I am COMPLETELY lost on this! Can you please show me how your worked out the answere using the figures from the question. Thanks. Question: (a) …
  7. Math

    I'm learning series and sequences (grade 11). Please check that my steps show I understand what I'm doing/the concept and my answer as well: 5. The consecutive terms of an arithmetic sequences are 3.6, y, 8.2. Find the value of y. …
  8. MATH

  9. Math

    Whoever can help with a question I posted earlier. I am very sorry; I put the wrong variable in the question. Question is to solve for y and not "x" as my previous message and the equation is: x = 3(r + ty) So sorry for the confusion. …
  10. DrBob222-re: chem question

    Sorry, I did make an error when I posted the earlier question: It should have said: A solution has [OH-] = 2.0 x 10-^14 M. The [H+] in this solution is?

More Similar Questions