Notices
Results 1 to 8 of 8

Thread: sound

  1. #1 sound 
    Forum Freshman
    Join Date
    Dec 2006
    Posts
    22
    can sound be harnessed into usable energy for us? for practical use?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Guest
    Do you mean as in Ultrasound, Sonar etc [practical uses of sound] or "can you power your radio from sound"

    If the latter, there is a neat litle device you can buy to turn sound energy into electrical energy...


    Reply With Quote  
     

  4. #3  
    Forum Bachelors Degree The P-manator's Avatar
    Join Date
    Nov 2005
    Location
    Toronto
    Posts
    474
    I guess you have to turn the sound vibrations into electricity. By making electro-magnets vibrate to make an electrical current?
    Pierre

    Fight for our environment and our habitat at www.wearesmartpeople.com.
    Reply With Quote  
     

  5. #4  
    Guest
    It's called a microphone. Incidentally also I think of Edison's sound power engine. It comprised a 'speaker' into which you yelled, this was connected to a rod which 'ratcheted' a wheel, - yes you guessed it, it never got to the shops for Christmas.

    Can't find it on the net but in one of my books "Engines, the search for power" by John Day it is illustrated.
    Reply With Quote  
     

  6. #5  
    Forum Bachelors Degree The P-manator's Avatar
    Join Date
    Nov 2005
    Location
    Toronto
    Posts
    474
    Well Edison's engine was basically the precursor to the microphone. And what is this topic doing in the Chemistry forum?
    Pierre

    Fight for our environment and our habitat at www.wearesmartpeople.com.
    Reply With Quote  
     

  7. #6  
    Guest
    Edison's sound engine was invented in 1878. The Microphone was invented in 1876, ie two years earlier.

    Source: - the book for the sound engine and wiki on the microphone.
    There is eveidence of earlier mic as well.

    Hang on a minute - this is Physics not chemistry - thread moved.
    Reply With Quote  
     

  8. #7 Re: sound 
    New Member tnho's Avatar
    Join Date
    Jan 2007
    Location
    HKSAR
    Posts
    4
    Quote Originally Posted by Darthskywalker699
    can sound be harnessed into usable energy for us? for practical use?
    Yes. Basically, we can try to covert the sound energy to mechanical energy (vibrations) and then to electrical energy. There is , as was introduced above, some small devices like microphone can do this job for you.

    However, it may not be practical if you want to use sound to generate electricity like those in power plants. This is because different kinds of energy are somehow classified and ranked. Sound and heat energy are examples of lower ranked energy while electical and mechanical energy are examples of higher ranked energy. It is easy to convert those higher ranked energys to the lower, but the reverse process is difficult. The reason for this is relatedl to the entropy change in these processes.
    Reply With Quote  
     

  9. #8  
    Forum Radioactive Isotope mitchellmckain's Avatar
    Join Date
    Oct 2005
    Location
    Salt Lake City, UTAH, USA
    Posts
    3,112
    Sound, heat and light are all dispative forms of energy radiating out in sphere from a point source, so it is rather difficult to gather it all back and to one place in order to convert it to something else. However it is possible. But of all of these light is the highest energy and being near such a very strong source of it (the sun) makes it the most useful. Heat is the next highest energy and we do tap it as well in geothermal energy. As the lowest energy sound would be the least useful, but it may indeed provide a useful source of energy for some neat invention for use in a location of intense noise, such as on a train or plane, or in a factory.
    See my physics of spaceflight simulator at http://www.relspace.astahost.com

    I now have a blog too: http://astahost.blogspot.com/
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •