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Radio Telescope at Arecibo, Puerto Rico

  1. Apr 4, 2009 #1
    Minimum Resolution Angle Problem

    1. The problem statement, all variables and given/known data

    The radio telescope at Arecibo, Puerto Rico, has a reflecting spherical bowl of 295 m diameter. Radio signals can be received and emitted at various frequencies with appropriate antennae at the focal point of the reflecting bowl. At a frequency of 300 MHz, what is the angle between two stars that can barely be resolved?

    (The answer is supposed to be in mrads)

    2. Relevant equations

    (theta)min=1.22(lambda)/d

    Lambda=(3.0E8)/(frequency)

    3. The attempt at a solution

    I tried converting the frequency to wavelength, and then plugging the wavelength, which I found to be 1m, and the given information into the first equation that I wrote down. The answer that I entered, .004136, wasn't correct, so I'm not sure if it's a wrong unit conversion, or I'm doing this wrong. First off, is the answer that I found in degrees? If it is, then would I need to convert it to radians? Secondly, what do they mean by mrads? Is it milli-radians?

    Thank you.
     
    Last edited: Apr 4, 2009
  2. jcsd
  3. Apr 5, 2009 #2

    Kurdt

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    Staff Emeritus
    Science Advisor
    Gold Member

    The answer will be in radians. Yes mrads means milliradians.
     
  4. Apr 5, 2009 #3
    Solved it. Thank you Kurdt.
     
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