0
There is the 1/r law for sound pressure and distance. Double the distance from a sound source gives 6 dB less sound pressure level. Scroll down to related links and look at "Sound pressure and the inverse distance law ".
Wiki User
∙ 15y ago
Wiki User
∙ 12y agoA doubling of distance from the sound source in the direct field will reduce the "sound level" by 6 dB, no matter whether that are sound pressure levels or sound intensity levels. This will reduce the sound pressure p (sound field quantity) to 1/2 (50 %) and the sound intensity I (sound energy quantity) to 1/2² = 1/4 (25 %) of the initial value.
The inverse distance law 1/r shows the distance performance of field quantities and the inverse square law 1/r² shows the distance performance of energy quantities. Squared sound field quantities are proportional to sound energy quantities; e.g. p² ~ I.
The sound pressure p changes (decrease - drop - fall) with 1/r over distance. Sound pressure level decreases by (−)6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.
Sometimes it is said that the sound pressure would change with 1/r². That is really wrong.
Add your answer:
Earn +20 pts
Describe ways that echoes are used in measurement?
The speed of sound is the distance travelled by the sound waves in the time between the original sound and the echo. For a direct echo, the distance travelled is double the distance to the reflecting surface.
What distance is the sound intensity level 25dB?
That depends on the sound intesity level at the point of origen. Sound fall of with the square of the distance but the original intensity must be known.
What is the relation between frequency and distance of propagation?
Frequency and distance are directly proportional the higher the frequency the more distance for the sound to dissipate th lower the frequency th shorter the distance for the sound to dissipate
What is the speed of sound in us customary?
Speed of sound in air doesn't vary with nationality, but it does vary with altitude/temperature. It's usually around 340 meters/second.
When a sound is straight ahead of you its?
A short distance
What does sound front mean at obx?
,This is how we classify the sound front properties that we manageSoundside:These homes are located West of Highway 158 from Southern Shores to Nags Head and West of Highway 12 from Southern Shores to Corolla. The distance to the Sound and views vary. Homes may not have direct access to the Sound.Soundfront:These properties front the Sound with no homes or lots in between. The distance to the sound, access to the sound and the view vary. Sunsets can be gorgeous!
The pitch of a sound is the distance from the sound source?
The pitch of a sound means the frequency. That stays constant with distance. You mean the sound pressure level that decreases with distance.
Ways to measure sound from an distance?
to measure sound from distance use decibels
What is the minimum distance of echo?
Depends on the quality of the sound. The minimum distance to hear an echo will be partly based upon the observers ability to resolve different sounds (i.e. so that they can distinguish between the actual noise, and the arrival of the reflected sound - a little 100 year old lady may not be as good as a 15year old!). This will vary between observers, as their auditory reaction times vary In the perfect Physics world though: Assuming a sharp sound (like a gunshot) the minimum distance (d=vt) to hear distinct echo is 17.2m considering the speed of sound to be 344ms. In general the "minimum echo distance" is always equal to half a wavelength from the reflector.
What distance is loudness of sound measured?
There is really no standard distance from the sound source where the sound pressure level (SPL) is measured.
What is the effect of distance on sound?
The sound pressure decreases with distance r in a free field (direct field).The next question is. How does the sound decrease with increasing distance? After which law?The sound pressure p diminishes with distance after the 1/r law. Sound pressure decreases inversely as the distance increases with 1/r from the sound source. The Sound pressure level (SPL) decreases by (−)6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.Sometimes it is said, that the sound decreases with with 1/r², the inverse square law. That is really wrong.Scroll down to related links and look at "Damping of sound level with distance".p2 / p1 = r1 / r2 and p2 = p1 x r1 / r2p1 = sound pressure 1 at reference distance r1 from the sound source.p2 = sound pressure 2 at another distance r2 from the sound source.Scroll down to related links and look at "How does the sound or the noise decrease with distance?"
What is the use sound to find distance?
Are you looking for the inverse distance law? How sound pressure decreases with distance? Scroll down to related links and look at "Sound pressure p and the inverse distance law 1/r".
Does the mars rover take in sound or distance?
sound
What distance is the loudest sound made by a spider?
At a very close distance to the spider you hear the loudest sound.
What effect does distance have on sound?
The sound pressure decreases with distance after the distance law 1/r. (No squre!) Our ear drums are only moved by the sound pressure of the air. Scroll down to related links and look at "Inverse Distance law".
What happen to the loudness of sound as the distance incrase between a person and the source of the sounds?
Don't use the word loudness, because that is a psychoacoustic personal feeling. Look for sound pressure.The sound pressure decreases with distance r in a free field (direct field).The next question is. How does the sound decrease with increasing distance? After which law?The sound pressure p diminishes with distance after the 1/r law. Sound pressure decreases inversely as the distance increases with 1/r from the sound source. The Sound pressure level (SPL) decreases by (−)6 dB per doubling of distance from the source to 1/2 (50 %) of the sound pressure initial value.Equations: p2 / p1 = r1 / r2 and p2 = p1 x r1 / r2 or r2 = r1 x p1 / p2p1 = sound pressure 1 at reference distance r1 from the sound source.p2 = sound pressure 2 at another distance r2 from the sound source.Scroll down to related links and look at "How does the sound or the noise decrease with distance?"
What is the relationship between sound and distance?
Sound pressurefalls inversely proportional to the distance 1/rfrom the sound source.At the double distance there is half of the sound pressure or -6 dB of the sound pressure level.Sound travels at a finite speed (around 343 m/s at 20°C) at double the distance it takes twice as long to arrive.
