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Question by Kris
Submitted on 3/3/2004
Related FAQ: sci.physics Frequently Asked Questions (Part 1 of 4)
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What is the fundamental source of electromagnetic radiation?

Which requires a physical medium in which to travel: Light,sound, both. Explain.

When you look at a distant galaxy through a telescope, how is it that you're looking backward in time?


Answer by kgbspy
Submitted on 3/24/2004
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The fundamental source of EM radiation is a vibrating electron.  The rate at which it is vibrated creates the frequency of the radiation.

Sound requires a physical medium in which to travel, light does not.  Sound relies on vibrating molecules of the substance it is traveling through.  Picture a room full of tennis balls.  Light travels in the form of a wave or a particle and thus doesn't need a medium in which to travel.

When we look at a distant galaxy we look back in time due to the fact that light travels at a set and finite speed in a vacuum (app. 3.0 x 10^8 m/s).  Since it only travels at that speed, it takes a set amount of time for the light to get here.  Ex: Alpha Centauri, 4.1 light years away, light takes 4.1 years to reach us

 

Answer by kkodees
Submitted on 6/3/2004
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what you mean by network protocol?

 

Answer by hahhaa
Submitted on 6/25/2004
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A network Protocol is a method by which the a node in the network communicate with another. It deffines the way the packets are transmitted and received.

Examples of network some protocols are TCP/IP, PPP, SPX/IPX, SNPT, PAP.

 

Answer by rex
Submitted on 5/31/2007
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SPACE.

 

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