The Naked Scientists

The Naked Scientists Forum

Author Topic: sound waves  (Read 2737 times)

Offline qazibasit

  • Sr. Member
  • ****
  • Posts: 344
    • View Profile
sound waves
« on: 27/05/2005 17:42:39 »
well i was thinking about the sound waves and i was thinking whether sound waves can escape from the black hole coz it is not particle in nature like the light waves.


 

Offline daveshorts

  • Moderator
  • Neilep Level Member
  • *****
  • Posts: 2583
  • Physics, Experiments
    • View Profile
    • http://www.chaosscience.org.uk
Re: sound waves
« Reply #1 on: 27/05/2005 20:03:49 »
sound waves do appear to be made up of particles in the same way as light waves are, they are called phonons.

Remember a sound wave has to move through a medium and if that is moving towards the black hole fast, the sound wave won't get out. Basically if light can't get out nothing can - pretty much
 

Offline chimera

  • Sr. Member
  • ****
  • Posts: 475
    • View Profile
Re: sound waves
« Reply #2 on: 28/05/2005 10:38:04 »
Here'a a Java applet showing it in action:

http://dept.kent.edu/projects/ksuviz/leeviz/phonon/phonon.html

The only radiation that in theory can leak out of a black hole aka Hawking radiation is actually a virtual pair of particles created at the edge of the black hole of which one is sucked into the black hole, but the other escapes as radiation. If you'd have to start at the bottom of the black hole there is supposedly no force in this universe that could lift anything out, be it particle or a message in a bottle.

The living are the dead on holiday.  -- Maurice de Maeterlinck (1862-1949)
 

The Naked Scientists Forum

Re: sound waves
« Reply #2 on: 28/05/2005 10:38:04 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums