what is the definition of sound?
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The speed of sound: 340.29 m / s
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music. music. music. :0)\n\n(isn't that music to your ears?)
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Yeah, it will produce a compression wave in the air - which is the definition of sound.  It doesnt matter if someone is there to hear it or not.  A sound is still made.
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This is a tried and true question of Philosophy.  The way one answers shows how human-centered your viewpoint of the natural world is.\nSound is a phenomenon with definite physical, scientifically testable characteristics, e.g. displacement of air molecules; nevertheless, if a HUMAN is not around to hear the sound, does it count? If there is no eardrum to be impacted by the airwaves, is it even a sound? Well, I would have to say that the first person here today has it right-- this is Yahoo Answers. Anything is possible. Except sound.
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This is essentially a question of definitions, i.e. how you define sound or noise. \n\nHere are the two basic answers. \n\nYes \n\nA noise is a sound and a sound is a set of vibrating molecules referred to as sound waves. If a tree falls in the forest and makes a sound, it makes molecular vibrations, or sound waves, whether any human ear drum is around to sense them or not. So yes, it makes a noise. A person hearing it is irrelevant to the being of the sound. A person hearing it is only relevant to human consciousness of the sound. \n\nAnother argument for this viewpoint is based on theology. God observes the entire universe. \n\nNo \n\nIf a tree falls, and no one is around to hear it, it does not make a noise by definition. What is noise? What is sound? One must make sure to look at this question not from such a skewed view point to realize that he or she is being misled. From an early stage in our lives, through modern science, it is FACT that sound waves are processed in our brains, thus if we are not near the sound it is just an assumption that it does make a noise. \n\nSound travels through our ears, into the canal, and into the brain to allow for it to be processed by the brain, allowing for us to differentiate due to experiences that yes, it is that particular noise. However, one would not know the sound to be that way if they cannot imagine the situation. Thus, a human being or another entity must be present to absorb the vibrations, waves, etc in order to process the information. \n\nSome take this further and claim that the whole universe does not really exist until it is observed.
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A planet does not produce sound as it moves.\n\nThe ancient people had a term 'musica universalis' (song of the planets), however this does not mean the planets make sounds; rather it was a mathematical concept (the planets were thought to be related by the whole-number ratios of pure musical intervals).
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Sight. The speed of light, that's what people say to describe something very fast. Have you heard people say the speed of sound instead? I haven't.
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Sound, as in sound waves?\n\nAmplitude, wavelength, pitch, frequency, longitudinal, vibration, echo, decibel, resonance.
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yes, it makes a noise, but it doesnt make a sound.  A sound is something that someone hears
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http://www.webplaces.com/html/sounds.htm
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http://en.wikipedia.org/wiki/Sound_waves
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The answer to this depends on if you are a physicist or a biologist! A physicist would say "yes" because to him/her sound is vibration of air molecules which will occur when a tree falls. \n\nA biologist, however would say "no" because sound is a perception in the brains of living things capable of perceiving it. The perception is a brain's interpretation of the nerve signals sent to it as a result of vibrations causing the eardrum to vibrate, then the ossicles in the middle ear, then the fluid in the cochlea, then the hair cells etc. There is no sound until a brain perceives it, only vibrating air.\n\nEven if the vibrations are recorded, there is still no sound until the recording is played and heard/interpreted by a capable brain.
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onomatopoeia  \nn. The formation or use of words such as buzz or murmur that imitate the sounds associated with the objects or actions they refer to.\n\nfrumpy\nadj : primly out of date
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The production of light as a result of the passing of sound waves through a liquid medium. The sound waves cause the formation of bubbles that emit bright flashes of light when they collapse.
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What you really need a SOUND Lecture.\n\n- Introduction to sound waves, review of basic physics. \n- Review of basic physics; vibrational systems.  \n- Vibrational systems. \n- Waves. \n- Waves, speed of sound. \n- Resonance, harmonic series on strings.  \n- Harmonic series in pipes, sympathetic vibrations.  \n- Hearing.  \n- Logarithms in music, pitch. \n\nand lots more... at\n\nhttp://www.physics.cornell.edu/courses/p204/lectures2006.html
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Traffic noise is collective sound energy from motor vehicles. Noise is sound or  a sound that is loud, unpleasant, unexpected or undesired.
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Traditionally in English, noise is an unwanted sound (slighly bad or neutral).\n\nIn dealing with audio, noise is random hissing, like the sound of a TV with no arial (the visual of this is also called noise). When talking about signal to noise ratio, a high ratio means the desired sounds are much louder than the random noise (can be caused by interference).