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Homework Help: Looking at this simple light problem

  1. Mar 8, 2009 #1
    1. The problem statement, all variables and given/known data
    Hi everyone! This question is very simple, but I just cannot think of anything to explain it.

    The question is: A pillar in a concert hall can block the view of the audience but it has little effect on their hearing. Why?

    1)Light is a transverse wave while sound is a longitudinal wave.
    2)Light is a EM wave but sound is a pressure wave.
    3)Light has a smaller/larger (cant remember) wavelength compared to sound.
    4)Light travels faster than sound.


    All the options are tricky for me but I still put 2 as it is instinct (somewhat, but still no sense whatsoever). However, the answer is wrong and I still do not know the answer.

    Anyone help?

    Thanks.:blushing:
     
  2. jcsd
  3. Mar 8, 2009 #2

    Doc Al

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    Staff: Mentor

    What determines how light--or any other wave--bends around an obstacle? (Look up diffraction.)
     
  4. Mar 9, 2009 #3
    Ok....So diffraction. The longer the wavelength, the more it diffracts right? So sound has a longer wavelength?
     
  5. Mar 9, 2009 #4

    Doc Al

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    Staff: Mentor

    Right.
    I'm not telling! Look up the typical wavelengths for visible light and for sound. Compare.
     
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