![]() ![]() Read on in the Formual Fix section and you will see that the deciBel scale is a logarithmic scale based on powers of 10. But don't be fooled! The deciBel scale does not work that way. This may lead one to believe that sound A is 2 deciBels higher than sound B since it is two times the intensity. (Then again a casual effort to learn anything in Physics could be anything from futile to dangerous.) The first line states that if one sound is 10 times more intense than another, then its deciBel rating is 10 deciBels higher. The deciBel rating ( db) of a sound can be determined from the intensity ( I) of the sound (in Watts/m 2) using the formula: db = 10 Ī casual glance at the Math Magic section could be dangerous. If one sound is 10 4 times more intense than a second sound, then its Bel rating is 4 Bels higher and its deciBel rating is 40 deciBels higher. If one sound is 10 3 times more intense than a second sound, then its Bel rating is 3 Bels higher and its deciBel rating is 30 deciBels higher. If one sound is 10 2 times more intense than a second sound, then its Bel rating is 2 Bels higher and its deciBel rating is 20 deciBels higher. If one sound is 10 1 times more intense than a second sound, then its Bel rating is 1 Bel higher and its deciBel rating is 10 deciBels higher. The Bel rating of a sound is the number of times greater that it's intensity is than the intensity of the threshold of hearing (1.0 x 10 -12 W/m 2) - expressed as a power of 10. The deciBel rating of a sound is 10 times the Bel rating of the sound. There are 10 deciBels in 1 Bel so the Greek prefix deci means 1/10-th. The deci of deciBel is a Greek prefix similar to the more familiar milli-, centi- and kilo- which commonly precedes units such as liter, gram and meter (for example, centimeter and kilogram). If sound A is two times as intense as sound B, then sound A _ sound B.Įvery sound intensity has a unique deciBel rating. How is sound intensity mathematically related to the deciBel level of a sound? The greater the intensity of a sound, the greater the deciBel rating. It it based on the number of powers of 10 greater that one sound's intensity is relative to the intensity of the threshold of hearing. Because of the enormous range of intensities that humans can hear, a logarithmic scale is used to express the intensity of a sound. From the threshold of hearing at 1.0 x 10 -12 W/m 2 to the threshold of pain at 1.0 W/m 2, the range of intensities is enormous. The human ear is capable of detecting a wide range of intensities. If a sound has a high deciBel level, then that sound also has a _. What property of a sound wave is described by its deciBel rating? The deciBel scale is the logarithmic scale used to express the intensity of various sounds. The deciBel scale gives an indication of a sound's _. Reading: The Physics Classroom, Sound and Music Unit, Lesson 2, Part b The student should be able to compare sounds in terms of their intensity and deciBel level. The student should be able to recognize the role of the deciBel system and understand its logarithmic nature. Assignment SM3: Sound Intensity and DeciBel Levels
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