# What is the relationship between decibel and logarithm?

## What is the relationship between decibel and logarithm?

decibel (dB), unit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power, or for measuring the relative loudness of sounds. One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio.

### What is dB in log?

The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale.

#### Why is the decibel scale logarithmic?

So, to express levels of sound meaningfully in numbers that are more manageable, a logarithmic scale is used, using 10 as the base, rather than a linear one.

**How much louder is 20 dB compared to 10 dB?**

10 times louder

A 20 dB sound is 10 times louder than a 10 dB sound. The level of noise in a quiet bedroom, 30 dB, is 100 times louder than 10 dB. And 40 dB is 1,000 times louder than 10 dB.

**How many days does it take until 2500 people have viewed this video?**

This video will have 2500 total views approximately 28.7 days after it was posted.

## Why is dB measured in negatives?

When you turn up the volume of an amp you are actually decreasing the amount of restriction placed on that amp and in turn it plays louder. The negative number scale is a more accurate way to indicate the volume output.

### Is dB linear or logarithmic?

logarithmic

The decibel (dB) is a logarithmic unit used to measure sound level. It is also widely used in electronics, signals and communication. The dB is a logarithmic way of describing a ratio. The ratio may be power, sound pressure, voltage or intensity or several other things.

#### How decibels are calculated?

The most basic form for deciBel calculations is a comparison of power levels. As might be expected it is ten times the logarithm of the output divided by the input. The factor ten is used because deciBels rather than Bels are used.

**How do you solve a decibel problem with logarithms?**

This problem can be solved by finding I for decibel values of 120 dB and 85.0 dB, and then dividing the full intensity by the reduced intensity. The mathematical formula for logarithms needed is:

**Is the decibel scale logarithmic or exponential?**

Answer: The decibel scale is logarithmic, and so a small drop in the decibel intensity means a much larger drop in the intensity expressed as . This problem can be solved by finding I for decibel values of 120 dB and 85.0 dB, and then dividing the full intensity by the reduced intensity.

## What is a decibel (dB)?

DECIBEL (dB) The Decibel is a subunit of a larger unit call ed the bel. As originally used, the bel represented the power ratio of 10 to 1 betwe en the strength or intensity i.e., power, of two sounds, and was named after Alexander Graham Bell. Thus a power ratio of 10:1 = 1 bel, 100:1 = 2 bels, and 1000:1 = 3 bels.

### How is loudness measured in decibels?

“Loudness” is measured in decibels. The formula for the loudness of a sound is given by “dB = 10log[ I I0 ]” where I0 is the intensity of “threshold sound”, or sound that can barely be perceived. Other sounds are defined in terms of how many times more intense they are than threshold sound.