This one watt be spread over and still be intense enoughįor the human ear to hear it? What do you think? Football field? I don't know, a city? No, it turns out. How diluted could one watt be spread over? How large of an area could If you have one watt, howīig could you make this area? How, spread out. If you have one watt, how big of an area? A watt isn't really that much. Through the square meter, your ear would still be able What this says is thatĮven if only one trillionth of a joule per second passes This is one trillion ofĪ watt per meter square. Than that, a human ear that's healthy shouldīe able to detect it. What that means is this is the softest possible sound you can hear. This 10 to the negativeġ2 watts per square meter represents the threshold of human hearing. This part of the equation is my favorite. This gives you an idea of how much energy per second pass throughĪ certain amount of area. How many joulels of sound energy per second pass through the one square meter? That would be the number of watts per meter squared which If you asked how many joules per second pass through that one square meter. The power that passes through that area will be, how many joules? If you figure you how many joules pass through this one square meter. This doesn't have to beĪn actual physical object. Power's in, what? Power measure going to watts. You got your ear and a sound wave, say, is coming toward your ear. What this means, think about it this way. In Physics, intensity is defined to be the power divided by the area. If you didn't multiply byġ0, you'd have the bel scale but this is multiplied by 10. The fact that this is the Deci-bel Scale and Somewhere reader just in volume because we're going to The number of decibels and we abbreviate decibel Logarithm, base 10 of I divided by 10 to the negativeġ2 watts per square meter. This is the scale that we use to figure out the loudness of a sound. The decibel scales differ by a factor of two, so that the related power and root-power levels change by the same value in linear systems, where power is proportional to the square of amplitude.I'm going to tell you about the Decibel Scale. When expressing root-power quantities, a change in amplitude by a factor of 10 corresponds to a 20 dB change in level. That is, a change in power by a factor of 10 corresponds to a 10 dB change in level. When expressing a power ratio, it is defined as ten times the logarithm in base 10. The decibel expresses a change in value (e.g. Two signals whose levels differ by one decibel have a power ratio of 10 1⁄ 10, or root-power ratio of 10 1⁄ 20. It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. The decibel is a relative unit of measurement equal to one tenth of a bel. The decibel is used to express the values of logarithmic ratio quantities whose numerical values are based on the decadic logarithm. 1 dB = 0.1 B, where one bel is equal to the decadic logarithm of a ratio between two power quantities of 10:1, or the decadic logarithm of a ratio between two root-power quantities of √10:1 One decibel is equal to one tenth of a bel, symbol B. The decibel, symbol dB, is a non-SI unit accepted for use with the SI. Decibel Non-SI unit accepted for use with SI Name
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