Relation to wave length and speed of sound.

richard.C. · 10th September 2010, 01:07 PM

Sound travels approximately 343m/s right, given air temp or atmosphere as a variable. But does a particular wave length have a different arrival time to another. Say does a 100Hz wave length, compaired to 1000Hz and 10KHz arrive the same time or earlier given its a longer wave length. 100hz = 3.4m 1000 = 34cm 10000 = 3.4cm. Or does the 1KHz signal just develop or reproduce 10 times to the 100Hz single production before it reaches the listener.. ?

SemperFi · 10th September 2010, 01:40 PM

Depends if it's a tube source or an opamp...just kidding.

Yes. The sound arrives at the same time, since the speed of sound is the speed of sound. The frequency gives each sound it's pitch.

janneman · 10th September 2010, 01:46 PM

Quote:

Originally Posted by richard.C.

Sound travels approximately 343m/s right, given air temp or atmosphere as a variable. But does a particular wave length have a different arrival time to another. Say does a 100Hz wave length, compaired to 1000Hz and 10KHz arrive the same time or earlier given its a longer wave length. 100hz = 3.4m 1000 = 34cm 10000 = 3.4cm. Or does the 1KHz signal just develop or reproduce 10 times to the 100Hz single production before it reaches the listener.. ?

Yes they do. Look at it as air vibrations. They vibratins from a source get at the destination in the same time, independent of frequency. But with the higher freq, the number of vibrations at a particular arrival point that arrive per time unit is higher. But it takes them the same time to get from source to arrival.

jan didden

Enzo · 11th September 2010, 04:05 AM

A simple test of that is to set a speaker on your porch, playing music. Now walk to the far end of the lawn and listen. If the music is still coherent, then all the frequencies are arriving together. If different frequencies propagated at different speeds, then the complex sound of the music would have spectrumised itself as light does traversing a prism.

Jacques Merde · 12th September 2010, 05:25 PM

Actually, the velocity of propagation of sound in air is a function of frequency. According to work done by the NIST and reproduced in the CRC Handbook of Physics, at 20 C and 20% RH, the VOP at 20Hz is 1127.568 ft/sec and at 20 kHz it is 1127.893 ft/sec, a difference of 0.325 ft/
sec or about 0.04%.

This is nearly always ignored in practice.

10th September 2010, 01:07 PM	#1
richard.C. diyAudio Member Join Date: Jan 2006 Location: Sydney	Relation to wave length and speed of sound. Sound travels approximately 343m/s right, given air temp or atmosphere as a variable. But does a particular wave length have a different arrival time to another. Say does a 100Hz wave length, compaired to 1000Hz and 10KHz arrive the same time or earlier given its a longer wave length. 100hz = 3.4m 1000 = 34cm 10000 = 3.4cm. Or does the 1KHz signal just develop or reproduce 10 times to the 100Hz single production before it reaches the listener.. ?

12th September 2010, 05:25 PM	#5
Jacques Merde diyAudio Member Join Date: Oct 2009	Actually, the velocity of propagation of sound in air is a function of frequency. According to work done by the NIST and reproduced in the CRC Handbook of Physics, at 20 C and 20% RH, the VOP at 20Hz is 1127.568 ft/sec and at 20 kHz it is 1127.893 ft/sec, a difference of 0.325 ft/ sec or about 0.04%. This is nearly always ignored in practice. __________________ "For every complex problem, there is a solution that is simple, neat, and wrong." -- H.L. Mencken

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Speed of Sound	MtnBob	Multi-Way	8	10th April 2006 10:39 PM
Wave length	David R. Carlso	Multi-Way	2	16th January 2006 12:34 PM
what is the relation between the Sound quality and the dispersion ?	diysmartdeep21	Multi-Way	9	18th February 2005 06:28 PM
Speed of sound and temperature	keyboarder89	Everything Else	7	15th February 2005 05:50 PM
Does the speed of sound change? Opinions...	purplepeople	Multi-Way	15	11th July 2003 05:13 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

10th September 2010, 01:40 PM	#2
SemperFi diyAudio Member Join Date: Jan 2002 Location: nowhere	Depends if it's a tube source or an opamp...just kidding. Yes. The sound arrives at the same time, since the speed of sound is the speed of sound. The frequency gives each sound it's pitch.

11th September 2010, 04:05 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	A simple test of that is to set a speaker on your porch, playing music. Now walk to the far end of the lawn and listen. If the music is still coherent, then all the frequencies are arriving together. If different frequencies propagated at different speeds, then the complex sound of the music would have spectrumised itself as light does traversing a prism.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)