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The logarithmic graph is a better way of looking at wide frequency ranges. Imagine if you had a normal graph from 10 to 20,000. The 10 to 100Hz part would be small.

Also, if you take a ruler and physically measure the distance between 10Hz and 20Hz on the graph, you will see that that distance is equal to any other distance between two frequencies which are a multiple of 2 of each other. For example, 40Hz and 80Hz.

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Also this is why we measure sound level in decibels - another logarithmic scale - because that is how we "hear" it.

3dB is double in power, however we perceive 10dB to be twice as loud!

That's debatable. Some say it was Joost Bürgi of Switzerland who discovered logarithms in 1610, but didn't write about it until after John Napier of Scotland published the first book on it in 1614.how did we determine the physical spacing in plotting or making the graph?

Did you never work with log graphs in school?

brucek

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