What is Logarithmics used for in daily life

• zhenhong

  25 Apr 08, 23:46

  What is Logarithmics used for in daily life? Provided you are not aiming to be a Bio-Logist. Neither a Astronomer.

• eagle

  25 Apr 08, 23:49

  Heavy usage in engineering fields too

  But if you meant daily life like walking around the neighbourhood aimlessly, then nothing in school is used, other than simple maths when you buy things...

• purpledragon84

  25 Apr 08, 23:51

  Originally posted by zhenhong:

  What is Logarithmics used for in daily life? Provided you are not aiming to be a Bio-Logist. Neither a Astronomer.

  alot of maths that we learn do not apply to daily life.. when was the last time u used Sine Cosine and Tangent for ur daily life..? =)

• MohamedF

  26 Apr 08, 00:10

  Originally posted by purpledragon84:

  alot of maths that we learn do not apply to daily life.. when was the last time u used Sine Cosine and Tangent for ur daily life..? =)

  I used it when calculating berrings and distance when plotting a a map... :)

• purpledragon84

  26 Apr 08, 00:17

  Originally posted by MohamedF:

  I used it when calculating berrings and distance when plotting a a map... :)

  everyday?? wah.. lol.. not me man.. haha.. for me sine cosine tangent only used to do more maths and engineering qns.. haha.. not in my daily life..

• hiphop2009

  26 Apr 08, 01:01

  do u noe dat when light passes through your cornea to your retina, there is some logarithmics involved?

• Darkness_hacker99

  26 Apr 08, 13:50

  =.=" I was about to bring out all the DNA stuff when I read...
  
  "Provided you are not aiming to be a Bio-Logist."

• FirePig

  26 Apr 08, 14:47

  logarithmic are used heavily in computer science.

• CS Pang

  26 Apr 08, 15:11

  Seriously, these maths thingy areonly to be use in lessons, thats what i as a normal person thinks

• FirePig

  26 Apr 08, 15:16

  maths are branched out to many other subjects. Accounting, computing, econs, engineering, business, medicine, chemistry, biology, physics all require a certain amount of mathematical rigour.

• ^tamago^

  26 Apr 08, 16:01

  Decibels Ritcher scale
• rain-coat

  26 Apr 08, 16:07

  tutoring your kids in maths

• hiphop2009

  26 Apr 08, 16:24

  and scoring As in ur Amaths. logarithmic is the easiest part to score.

• annoy-you-must

  26 Apr 08, 18:25

  if you are talking about living life in a simple usual manner, then logarithmics has got no relavance at all with regards to application in daily life.

  but of course, if everyone have that mindset, then mankind will never progress. after all, maths and sciences are vital tools that allow us to understand the logic behind how this world works.

• FirePig

  26 Apr 08, 18:51

  Various quantities in science are expressed as logarithms of other quantities; see logarithmic scale for an explanation and a more complete list.

  • In chemistry, the negative of the base-10 logarithm of the activity of hydronium ions (H₃O⁺, the form H⁺ takes in water) is the measure known as pH. The activity of hydronium ions in neutral water is 10⁻⁷ mol/L at 25 °C, hence a pH of 7.

  • The bel (symbol B) is a unit of measure which is the base-10 logarithm of ratios, such as power levels and voltage levels. It is mostly used in telecommunication, electronics, and acoustics. The Bel is named after telecommunications pioneer Alexander Graham Bell. The decibel (dB), equal to 0.1 bel, is more commonly used. The neper is a similar unit which uses the natural logarithm of a ratio.

  • The Richter scale measures earthquake intensity on a base-10 logarithmic scale.

  • In spectrometry and optics, the absorbance unit used to measure optical density is equivalent to −1 B.

  • In astronomy, the apparent magnitude measures the brightness of stars logarithmically, since the eye also responds logarithmically to brightness.

  • In psychophysics, the Weber–Fechner law proposes a logarithmic relationship between stimulus and sensation.

  • In computer science, logarithms often appear in bounds for computational complexity. For example, to sort N items using comparison can require time proportional to the product N × log N. Similarly, base-2 logarithms are used to express the amount of storage space or memory required for a binary representation of a number—with k bits (each a 0 or a 1) one can represent 2^k distinct values, so any natural number N can be represented in no more than (log₂ N) + 1 bits.

  • Similarly, in information theory logarithms are used as a measure of quantity of information. If a message recipient may expect any one of N possible messages with equal likelihood, then the amount of information conveyed by any one such message is quantified as log₂ N bits.

  • In geometry the logarithm is used to form the metric for the half-plane model of hyperbolic geometry.

  • Many types of engineering and scientific data are typically graphed on log-log or semilog axes, in order to most clearly show the form of the data.

  • In inferential statistics, the logarithm of the data in a dataset can be used for parametric statistical testing if the original data does not meet the assumption of normality.

  • Musical intervals are measured logarithmically as semitones. The interval between two notes in semitones is the base-2^1/12 logarithm of the frequency ratio (or equivalently, 12 times the base-2 logarithm). Fractional semitones are used for non-equal temperaments. Especially to measure deviations from the equal tempered scale, intervals are also expressed in cents (hundredths of an equally-tempered semitone). The interval between two notes in cents is the base-2^1/1200 logarithm of the frequency ratio (or 1200 times the base-2 logarithm). In MIDI, notes are numbered on the semitone scale (logarithmic absolute nominal pitch with middle C at 60). For microtuning to other tuning systems, a logarithmic scale is defined filling in the ranges between the semitones of the equal tempered scale in a compatible way. This scale corresponds to the note numbers for whole semitones. (see microtuning in MIDI).

  http://en.wikipedia.org/wiki/Logarithm

• escadaraindrops

  27 Apr 08, 13:49

  lol~ serious man firepig! haha you go and research on log! haha

   

  Log isn't that hard, secondary 3 chapter 2 of A math. Just follow textbook example can one! I remember i cried when i couldn't get log last year! hahah @.@ but i mastered it by doing the textbook questions. took super long! but worth it! (:

• eagle

  27 Apr 08, 13:53

  Originally posted by escadaraindrops:

  lol~ serious man firepig! haha you go and research on log! haha

   

  Log isn't that hard, secondary 3 chapter 2 of A math. Just follow textbook example can one! I remember i cried when i couldn't get log last year! hahah @.@ but i mastered it by doing the textbook questions. took super long! but worth it! (:

  This will be what I call question based approach to scoring

   

• FirePig

  27 Apr 08, 14:17

  I didnt refresh on log. What's so difficult about that? Its just a way of expressing powers of numbers...