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Topic: Echo (phenomenon)

	Echo (phenomenon) Info - Encyclopedia WikiWhat.com (Site not responding. Last check: 2007-08-20)
		The intensity of an echo is frequently measured in dB relative to the directly transmitted wave.
		Echoes may be desirable (as in radar) or undesirable (as in telephone systems).
		In computing, an echo is the printing or display of characters (a) as they are entered from an input device, (b) as instructions are executed, or (c) as retransmitted characters received from a remote terminal.
	wikiwhat.com /encyclopedia/e/ec/echo__phenomenon_.html (246 words)

	Echo - Wikipedia, the free encyclopedia
		Echo sounding, a way to measure water depth.
		Echo (computing), a Unix command to display a line of text.
		Echo (fidonet), a discussion forum on FidoNet, similar to a Usenet Newsgroup.
	en.wikipedia.org /wiki/Echo (303 words)

	Echo phenomenon - Wikipedia, the free encyclopedia
		Start the Echo phenomenon article or add a request for it.
		Look for Echo phenomenon in Wiktionary, our sister dictionary project.
		Look for Echo phenomenon in the Commons, our repository for free images, music, sound, and video.
	www.sciencedaily.com /encyclopedia/echo__phenomenon_ (135 words)

	Echo (phenomenon) Report @ Encyclopedia.LocalColorArt.com (Local Color Encyclopedia) (Site not responding. Last check: 2007-08-20)
		Echo (phenomenon) Report @ Encyclopedia.LocalColorArt.com (Local Color Encyclopedia)
		Thus, since the velocity of sound is approximately 343 m/s at a normal room temperature of about 20°C, a reflecting wall must be more than 16.2 m from the sound source at this temperature for an echo to be heard by a person at the source.
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	encyclopedia.localcolorart.com /encyclopedia/Echo_(phenomenon) (340 words)

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