Given: Sound intensity level LI = 150 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 I when entering sound intensity level LI = 150 dB:
I = Io×10^(LI/10) in W/m² = 10^−12×10^(150/10) = 1000 W/m².
Given: Sound intensity level LI = 70 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 I when entering sound intensity level LI = 70 dB:
I = Io×10^(LI/10) W/m² = 10^−12×10^(70/10) = 0.00001 W/m².
This is not really loud- something louder than ordinary conversational speech, but somewhat less loud than a vacuum cleaner.
This the approximate sound level of an ordinary conversation at about 1.5m separation.
Reference sound intensity Io = 10^−12 W/m² (Threshold of human hearing). Reference sound intensity level LIo = 0 dB-SIL (Threshold of human hearing intensity level). The sound intensity I is measured in watts per meter squared. The sound intensity LI level is measured in decibels (dB).
The sound pressure of 45 dB is about a quiet library and 50 dB is about an everage home.
That's the sound of the Earth disintegrating.
If you would like to measure how loud the sound is, dB, decibels, would be good. To give you a rough idea, a whisper is about 30 dB, a baby crying loudly about 100 dB. Also, if you like to measure the frequency or the wavelength, you can use Hertz.
You take a measuring microphone with a sound pressure level meter.
(90 dB - 70 dB) = 20 dB = 100 times as much sound power.(100 times 'as much' = 99 times 'more')
A normal conversation is about 70 decibels (dB). A gun firing off is about 140 dB.
90 > 70
The concert Db (meaning, the sounding Db, like it would sound on the piano) is Bb. The instrument's Db is C#.
If you would like to measure how loud the sound is, dB, decibels, would be good. To give you a rough idea, a whisper is about 30 dB, a baby crying loudly about 100 dB. Also, if you like to measure the frequency or the wavelength, you can use Hertz.
The 40dB sound is (40 - 20) = 20 dB louder than the 20 dB sound.20 dB louder = 10(20/10) = 102 = 100 times louder
The Sound of Music - The dB's album - was created in 1987.
60 dB sound pressure level is about conversational speech listened in 1 meter distance.
70 dB is 10 times louder than 60 dB.
The power in the wave is [ 30 dB = 1,000 times ] greater.
Decibels (dB)
If you would like to measure how loud the sound is, dB, decibels, would be good. To give you a rough idea, a whisper is about 30 dB, a baby crying loudly about 100 dB. Also, if you like to measure the frequency or the wavelength, you can use Hertz.