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How Does Sound Work?
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If I am listening to my music playing at 60 decibels on one radio and turn a second radio on 40 dB, is the music louder?
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Actually, I'll leave this for somebody who knows what they're talking about! I'm not sure that anybody does as yet. For example:
> https:/
> Noise is measured using the decibel (dB) scale, which reflects the sensitivity of human ears to different levels and frequencies of sound.
> Here are some examples:
> 0dB: the quietest sound a healthy human ear can hear
> 40dB: a quiet library
> 60dB: ordinary spoken conversation
...
> 130dB: an aeroplane taking off 100m away.
The last one is interesting ... "100m away". But it looks like there are different meanings of "decibels". See https:/
> https:/
> Noise is measured using the decibel (dB) scale, which reflects the sensitivity of human ears to different levels and frequencies of sound.
> Here are some examples:
> 0dB: the quietest sound a healthy human ear can hear
> 40dB: a quiet library
> 60dB: ordinary spoken conversation
...
> 130dB: an aeroplane taking off 100m away.
The last one is interesting ... "100m away". But it looks like there are different meanings of "decibels". See https:/
Pressed "answer now" in error...
10⁰= 1
10¹= 10
10²= 10×10= 100
10³= 10×10×10= 1,000
...
10⁶= 10×10×10×10×10×10 = 1,000,000
10⁷=10×10×10×10×10×10×10 =10,000,000
The wee numbers are the powers and when comparing the sizes of earthquakes, the difference between the two numbers shows how much more powerful one is compared to another.
Say there's one with a magnitude of 7.5 on the Richter scale and another that's 5.5 on the scale.
A difference of two doesn't sound a lot but a 7.5 earthquake is 10² or a hundred times more powerful than a 5.5 one.
The same applies to 3.5 compared to 1.5, the difference is two so the 3.5 earthquake is a hundred times more powerful than the 1.5 earthquake.
10⁰= 1
10¹= 10
10²= 10×10= 100
10³= 10×10×10= 1,000
...
10⁶= 10×10×10×10×10×10 = 1,000,000
10⁷=10×10×10×10×10×10×10 =10,000,000
The wee numbers are the powers and when comparing the sizes of earthquakes, the difference between the two numbers shows how much more powerful one is compared to another.
Say there's one with a magnitude of 7.5 on the Richter scale and another that's 5.5 on the scale.
A difference of two doesn't sound a lot but a 7.5 earthquake is 10² or a hundred times more powerful than a 5.5 one.
The same applies to 3.5 compared to 1.5, the difference is two so the 3.5 earthquake is a hundred times more powerful than the 1.5 earthquake.
my physics master did his thesis on phonics and sound but cdnt really teach us
Because the decibel scale is a logarithmic scale, if we have two different sound sources combining together we can't simply add the sound pressure levels - what we have to do is to add the intensities. That means we have to convert our decibel values into intensities (with units of W/m2).
so the pressure wave in the ear which assaults the ear drum is additive ( and is a power / area )
and we did it in CGS watts / cm2
BUT the sensation of loudness ( which should relate to watts /cm2 - doesnt. Shallow U shape.
a power X watts / cm2 at 1000 cps, does not sound as loud as the same power at 1500 cps
told you he cdnt explain it
piddy - he had done a thesis on it and cdnt explain it to 18 y olds
Because the decibel scale is a logarithmic scale, if we have two different sound sources combining together we can't simply add the sound pressure levels - what we have to do is to add the intensities. That means we have to convert our decibel values into intensities (with units of W/m2).
so the pressure wave in the ear which assaults the ear drum is additive ( and is a power / area )
and we did it in CGS watts / cm2
BUT the sensation of loudness ( which should relate to watts /cm2 - doesnt. Shallow U shape.
a power X watts / cm2 at 1000 cps, does not sound as loud as the same power at 1500 cps
told you he cdnt explain it
piddy - he had done a thesis on it and cdnt explain it to 18 y olds
