![]() The most common examples of sounds in this. Nevertheless, they are still considered loud. The decibel measures sound pressure or electrical pressure (voltage) levels. In order to obtain more information from the graph of the growth of bacteria, we can change one of the axes with a linear scale to a logarithmic scale and form a semi-log graph. Sounds ranging from 60 to 80 dB are not dangerous to human hearing. If you think about it, it would be very difficult to manufacture a. A sound meter uses a display with a decibel range and resolution to approximate the ear’s dynamic range, usually the upper range rather than the quiet part. If both axes use a logarithmic scale, then it is called a log-log graph. When you measure noise levels with a sound level meter, you measure the intensity of noise called decibel units (dB). If only one axis uses a logarithmic scale, then it is called a semi-log graph. The definition of a logarithmic scale is that it is a scale in which the units on the axes are powers or logarithms and are typically used when the increase or decrease in value on that axis is exponential. Recall that a logarithm is simply the power to which the base has to be raised to obtain a particular number. We use the decibel scale to determine how loud sounds are and if they are safe or harmful to human hearing. Therefore, a 10 dB sound is 10 times more intense than a 0 dB sound, a 20 dB sound is 100 times more intense, and a 30 dB sound is 1,000 times more intense. This is why logarithmic scales were developed. However, the decibel scale is logarithmic, not linear. We need a way to rescale one of the axes so that all the information can be used. Each axis on the graph uses a linear scale, so even though the information is accurately represented, it is very difficult to know what is happening with the growth of the bacteria until about the 8-hour point. This is a good graph, but it has a problem. ![]()
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