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Author Topic: Could a sound wave escape a black hole?  (Read 1705 times)

Offline Evil Eye

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Could a sound wave escape a black hole?
« on: 24/05/2010 08:30:02 »
Evil Eye  asked the Naked Scientists:
   
In a past episode of newbielink:http://www.thenakedscientists.com/HTML/podcasts/ [nonactive], someone asked if their calls for help from a black hole could escape.

But.... If you could scream loud enough.... could a sound wave escape?

What do you think?
« Last Edit: 24/05/2010 08:30:02 by _system »


 

Offline JP

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Could a sound wave escape a black hole?
« Reply #1 on: 24/05/2010 09:22:03 »
Welcome to the forum, Evil Eye. 

The short answer to your question is that even things moving at light speed aren't going fast enough to escape the pull of a black hole.  Since light is faster than sound, sound couldn't escape. 

The slightly longer answer is that sound is vibrations in matter, so you'd need to have some matter connecting you to a listener outside the black hole.  Particles of matter are connected by the electromagnetic force.  However, the electromagnetic force is the same thing light is made out of, so that if you can't send light from inside of the black hole to outside of the black hole, you also can't have matter connected from a point inside the black hole to a point outside the black hole.  No matter how tough your matter is, it would break apart at the black hole's event horizon.
 

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Could a sound wave escape a black hole?
« Reply #1 on: 24/05/2010 09:22:03 »

 

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