Real life scenario of logarithms is on of the most crucial concept in our life. As we know, in our maths book of 9th-10th class, there is chapter named as **LOGARITHM** is very interesting chapter and its questions are some typical that is required technique to solve.

But, after solving these questions and getting knowledge of logarithm, Have you think that why you study this chapter what is use of **LOGARITHM** in our daily life. The **LOGARITHM** is used in the following application of the real life.

Contents

## Real Life Application of Logarithm Earthquake Intensity Measurement

To know about the real life scenario of logarithms we start as an earthquake intensity measurement. For this, first we let to know some knowledge related to the earthquake measurement instrument known as * Seismograph*. which produces a graph output known as

**.**

*Seismograph* In the earthquake, a * Seismic* waves produces which travels through the Earth layer. The seismic wave gives out an energy that cause the earth to shake and also gives out low frequency acoustic energy.

Now, this seismic waves is recorded by the seismograph instrument and its output is the seismographs graph. It is a record of the ground motion in three co-ordinate axes (x, y, and z), with the z axis perpendicular to the Earth’s surface and the x- and y- axes parallel to the Earth’s surface.

An earthquake’s hypo-center is the position where the strain energy stored in the rock is first released, marking the point where the fault begins to rupture. This occurs directly beneath the epicenter, at a distance known as the focal depth.

The amplitude of the seismic waves decreases with distance. Now, the instrument seismograph is based on a logarithmic scale, which is developed by Charles Richter in 1932 devised the first magnitude scale for measuring earthquake magnitude.

This is commonly known as the **Richter scale**. The magnitude of an earthquake is calculated by comparing the maximum amplitude of the signal with this reference event at a specific distance.

## Real life scenario of logarithms

The **Richter scale** is a **base-10 logarithmic** scale, which defines magnitude as the logarithm of the ratio of the amplitude of the seismic waves to an arbitrary, minor amplitude.

where * A* is the amplitude of the earthquake recorded by the seismograph taken from 100 km (approx) from the epicenter of the earthquake and

*is the standard earthquake whose amplitude is 1 micron approx. The*

**S****magnitude of the standard earthquake**is

Since the Richter scale is a base-10 logarithmic scale, each number increase on the Richter scale indicates an intensity ten times stronger than the previous number on the scale.

Read : Why Log is not defined for negative base

For example: if we note the magnitude of the earthquake on the Richter scale as 2, then the other next magnitude on the scale is explained in the following table.

** **Now according to the Richter scale magnitude of the earthquake, there is a lot of bad effect on our environments which may be a danger to the real world. Its details are given below in the table.

Richter Magnitude | Description | Earthquake Effects |
---|---|---|

0-2.0 | Micro | Never Felt by People |

2.0-2.9 | Minor | Felt But Not Recorded |

3.0-3.9 | Minor | Felt But Not Damaged Cost |

4.0-4.9 | Light | Ceiling Lights Swing But Not Damaged |

5.0-5.9 | Moderate | Affects weak construction and cause wall crack |

6.0-6.9 | Strong | Affects area up to 160 km from the epicenter |

7.0-7.9 | Major | Affect area up to further area and cause several damaged |

8.0-8.9 | Great | Affect area beyond 100 miles and cause severe damaged |

9.0-9.9 | Great | Affect area beyond 1000 miles with disastrous effects |

10+ | Epic | Never Been Recorded |

This is the one of the real life scenario of logarithms, which must be know.

## Real Life Application of Logarithm in Determining pH Value

The Real Life scenario of Logarithms is to measure the acidic, basic or neutral of a substance that describe a chemical property in terms of pH value. To know this concept in details, click here.

## Real Life Application of Logarithm in Measuring Sound Intensity

As we known that the sound carries energy and it is defined as I = P/A, where P is the power through which the energy E flows through per unit area A which is perpendicular to the direction of travel of the sound wave.

Now, according to physics rule, the sound intensity is measured in terms of loudness which is measured in terms of logarithm. Thus the sound intensity is defined as the . In this definition, dB is the decibels. It is one-tenth of bel(B) and I and I_{0} are the sound intensity.

If I = I_{0}, then .

If I = 10I_{0}, then etc. Hence, we can the different values.

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