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How does intensity of a 40 decibel sound compare to intensity if a 20 decibel sound?
Wiki User
∙ 13y ago
The 40dB sound is (40 - 20) = 20 dB louder than the 20 dB sound.
20 dB louder = 10(20/10) = 102 = 100 times louder
Wiki User
∙ 13y ago
Wiki User
∙ 11y ago40 dB is more sound than 20 dB
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The decibel level of traffic in the street increases from 40 db to 60 db How much louder does the traffic noise seem How much greater is the intensity?
20 more than street intensity
What is Sound volume is measured in?
Sound volume is often measured in decibels. The decibel scale works in mnany ways. LOL+++Many ways indeed! it's not a simple matter, and we have to distinguish between intensity and power, which are not the same things. Most sound volumes figures are of Sound Pressure Level (SPL) in deciBels, and this is a brief explanation. It helps if know basic logarithm principles!The deciBel (dB) is not a measure of power or intensity of sound only, but can describe any acoustic, electrical or electromagnetic signal, so to use it properly you have to specify the right units and scale.Further, it is not a linear unit like a metre or a litre, but a product of a constant with the logarithm of a ratio! And that ratio's denominator is the reference levelrelevant to what you are measuring, and to which you compare the measured level.We use this logarithmic scale because the human ear is roughly logarithmic in response to sound pressure; and the maximum pressure it can bear for a short time painfully but without injury is 1 million times the faintest it could hear before too many of those maxima hit it for too long.In measuring sound in air by deciBels, you use 20µPa (20 micro-Pascals), where the Pascal is the official SI unit of pressure. It's an extremely tiny pressure, but still too big for acoustics, where you need to work in millionths of Pascals - i.e. micro-Pascals. (The standard abbreviation for 'micro' is the Greek letter µ.)Why 20µPa? It is the SPL of the faintest sound the fully-healthy human ear can detect - a staggeringly low 1/(5000 000 000) of Standard Atmospheric Pressure.So deciBels avoid clumsy calculations with lots of big exponents, and turns many of the sums into just adding and subtracting modest numbers.Therefore, measuring sound level in air, and without going into the derivation of the 20 constant, the SPL = [ 20 log-base-10 (measured pressure µPa / 20µPa) ] deciBels.So to quote the sound pressure level fully, it is N dB re[ferred to] 20µPa.Marine acoustics - dolphin calls, sonar etc. - uses a mere 1µPa as reference, so the two sound scales are not readily comparable.A measured level equal to its reference is 0dB in whatever scale you use, because the ratio is then 1, and as log-base-10(1) = 0, so 20log(1) = 0.Why can't you count from 0µPa? Because that makes the denominator 0, and you can't divide by 0.
What is the speed of sound at sea level at 20 degrees celsius in inches per second?
The sea level has nothing to do with the speed of sound. It's the temperature that matters. At 20° Celsius the speed of sound c = 343 m/s. At 20° Celsius the speed of sound is c = 13 503.937 inches/second.
Speed of sound through the air?
Speed of sound in air is c ≈ 331 + 0.6 × T. T = Temperature in °C. Speed of sound in air at 20°C is c ≈ 331 + 0.6 × 20 = 343 m/s.
Is sound measured in Hertz or Decibels?
Both, these two units measure different things.Hertz measures the frequency or pitch of the sound.Decibels measures the amplitude or loudness of the sound.
How does the intensity of a 40-decibel sound compare to the intensity 20-decibel sound?
100 times. Each bel (10 decibels) is ten times as loud thus 20 to 40 is 100 times.
What unit of measurement is used to compare the intensities of different sounds?
The unit is the decibel, based on a larger unit called a bel. The decibel is measured as a magnitude on a logarithmic scale, and has no dimension as such. An increase in the numerical value therefore indicates an exponential (logarithmic) increase in the actual intensity or power. Example : an increase of 3 dB is approximately twice the power, an increase of 10 dB is 10 times the power, and an increase of 20 dB is 100 times the power.
How does the intensity of a 40-decibel sound compare to the intensity of a 20-decibel sound?
Given: Sound intensity level LI1 = 40 dB and sound intensity level LI2 = 20 dB. Reference sound intensity Io = 10^−12 W/m² (Threshold of hearing) Reference sound intensity level LIo = 0 dB-SIL (Threshold of hearing level) Get sound intensity I1 when entering sound intensity level LI1 = 40 dB: Sound intensity I1 = Io×10^(LI/10) W/m² = 10^−12×10^(40/10) = 0.00000001 W/m² = 10^−8 W/m². Get sound intensity I2 when entering sound intensity level LI2 = 20 dB: Sound intensity I2 = Io×10^(LI/10) W/m² = 10^−12×10^(20/10) = 0.0000000001 W/m² = 10^−10 W/m². The sound intensity I1 = 10^−8 W/m² is 100 times more than the sound intensity I2 = 10^−10 W/m². The sound intensity level LI1 = 40 dB is 20 dB more than the sound intensity level LI2 = 20 dB.
What is the decibel formula?
The decibel, or dB, is a means of expressing the gain of an active device (such as an amplifier) or the loss in a passive device (such as an attenuator or length of cable). It is simply the ratio (!) of output to input expressed in logarithmic form. The decibel was developed by the telephone company to express the gain or loss in telephone transmission systems.Sound intensity (sound energy quantity):Reference sound intensity Io = 10^−12 W/m² (Threshold of hearing)Reference sound intensity level LIo = 0 dB-SIL (Threshold of hearing level)Get sound intensity I when entering sound intensity level LI:Sound intensity I = Io×10^(LI/10) W/m² = 10^−12×10^(LI/10) W/m².Get sound intensity level LI in dB when entering sound intensity I in W/m²:Sound intensity level LI = 10×log (I / Io) dB = 10×log (I / 10^−12) dB.Sound pressure (sound field quantity):Reference sound pressure po = 20 µPa = 2×10^−5 Pa (Threshold of hearing)Reference sound pressure level Lpo = 0 dB-SPL (Threshold of hearing level)Get sound pressure p when entering sound pressure level Lp:Sound pressure p = po×10^(Lp/20) Pa or N/m² = 2×10^−5×10^(Lp/20) Pa.Get sound pressure level Lp in dB when entering sound pressure p in Pa:Sound pressure level Lp = 20×log (p / po) dB = 20×log (p / 2×10^−5) dB.
What is the decibel of a whisper?
About 20 dB SPL (sound pressure level).
What is the scale used to define sound intensities?
Take a sound pressure level meter (SPL meter). Try to measure the sound pressure p in pascals or in decibels, referred to the threshold of hearing with 20 micropascals.
How many times louder is a 20 decibel sound than a 0 decibel sound?
100 times louder. You will hardly hear a 20 db(SPL) sound at all.
The decibel level of traffic in the street increases from 40 db to 60 db How much louder does the traffic noise seem How much greater is the intensity?
20 more than street intensity
How do the amplitudes of a 120-decibel sound and a 100-decibel sound compare?
-- A difference of 20 dB means the louder one is delivering 100 times as much power as the softer one is. -- The power delivered by any sinusoidal phenomenon is usually proportional to the square of the amplitude. So the amplitudes would have to be in the ratio of 10 to 1. The louder one has 10 times the amplitude of the softer one.
How do the amplitude of a 120 - decibel sound and a 100 - decibel sound compare?
-- A difference of 20 dB means the louder one is delivering 100 times as much power as the softer one is. -- The power delivered by any sinusoidal phenomenon is usually proportional to the square of the amplitude. So the amplitudes would have to be in the ratio of 10 to 1. The louder one has 10 times the amplitude of the softer one.
How are sound intensity levels measured?
The decibel level slowly increases and how much power it is producing quickly increases but not as quickly as stated in the webpages! there is no fixed number of times between two decibel levels and different measuring object will be having different number of objects at the same decibel for the next decibel level and a decibel level can be any number of decibels!
What is decibel?
A decibel is a unit of measurement which is used to indicate how loud a sound is. Continuous exposure to sound above 80 decibels could be harmful. a unit for measuring the loudness of sound (deci- + bel unit of sound power (20-21 centuries), from Alexander Graham Bell (1847-1922), US inventor). Unit for measuring the relative intensities of sounds or the relative amounts of acoustic or electric power.what is the decibel means.
