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Homework Help: I have a question on one of my classnotes

  1. Feb 8, 2007 #1
    I have a question on one of my papers and he never showed us how to do it and I don't understand.
    A 5 MHz, 1/2 dia, lat straight beam transducer in steel(velocity in sttel=.585 cm or .23 in) has a near field lenth? Can answer because I don't know how to do the math.
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Feb 8, 2007 #2
    First of all, your question does NOT make anysense to me.

    Second of all, you should try the problem yourself, and tell us where you are stuck on.
  4. Feb 9, 2007 #3
    I did try the problem. If you don't know how to do the problem then how can you do the problem. And I am asking some one to help with how to figure out the problem that I wrote about. so my question is how do I do that problem. Which is: A 5 MHz, 1/2 dia, lat straight beam transducer in steel(velocity in sttel=.585 cm or .23 in) has a near field length? Again How would I even know how to start this.
  5. Feb 9, 2007 #4


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    Staff: Mentor

    Please provide more background and information to help us understand the problem. I agree with l46kok that your problem statement is too terse and inaccurate for us to understand.

    Like, the units of velocity are not cm or inches, right? And what is a "lat straight beam transducer"? It sounds like some kind of ultrasonic transducer, but that's just a guess. And how does your text book define the "near field"? What fraction or number of wavelengths? The definition of near field varies from discipline to discipline. Also, is "sttel" just a typo for steel? I'm guessing that it is, but you repeated it twice (probably just a cut and paste).

    What course is this for? What textbook are you using?
  6. Feb 9, 2007 #5
    You should at least come up with relevant equations to work through this problem.

    We enforce these rules to prevent people from just posting the question without even trying and letting the helpers do your homework.
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