- #1

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After drawing, My professor told me that I must convert both values of the growth rate and the laser intensity to their values in the logarithmic scale.

I don't know how.

May I get a help.

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- Thread starter Amany Gouda
- Start date

I enjoy.In summary, In order to plot a graph of the data, you must first convert the growth rate and laser intensity to a logarithmic scale. Next, you must plot the data in two extra (log) columns on graph paper. Finally, you must mark the axis labels "Log(growth rate)" and "Log(intensity)."f

- #1

- 29

- 0

After drawing, My professor told me that I must convert both values of the growth rate and the laser intensity to their values in the logarithmic scale.

I don't know how.

May I get a help.

- #2

Science Advisor

Gold Member

- 28,373

- 6,607

Draw up a table of the results with an added column for each variable in which you put the log of the values - simple as that. Plot the values in the two extra (log) columns on ordinary graph paper. Mark the Axis labels "Log(growth rate)" and Log(intensity)" and don't worry about the fact that the actual numbers don't appear to make much sense. It will probably spread the points out nicely, compared with plotting on a linear scale.

Hint: If you can use a spreadsheet then this sort of thing is very convenient as you can easily plot graphs of the combinations of linear and logarithmic scales for each variable. It's very handy to do this sort of thing because it can often show you a straight line for one of the graphs. Get Into Spreadsheets!

- #3

- 413

- 73

Draw up a table of the results with an added column for each variable in which you put the log of the values - simple as that. Plot the values in the two extra (log) columns on ordinary graph paper. Mark the Axis labels "Log(growth rate)" and Log(intensity)" and don't worry about the fact that the actual numbers don't appear to make much sense. It will probably spread the points out nicely, compared with plotting on a linear scale.

Hint: If you can use a spreadsheet then this sort of thing is very convenient as you can easily plot graphs of the combinations of linear and logarithmic scales for each variable. It's very handy to do this sort of thing because it can often show you a straight line for one of the graphs. Get Into Spreadsheets!

print off some log-log and log-linear graph paper...plot your data...straight lines guaranteed

- #4

- 29

- 0

Draw up a table of the results with an added column for each variable in which you put the log of the values - simple as that. Plot the values in the two extra (log) columns on ordinary graph paper. Mark the Axis labels "Log(growth rate)" and Log(intensity)" and don't worry about the fact that the actual numbers don't appear to make much sense. It will probably spread the points out nicely, compared with plotting on a linear scale.

Hint: If you can use a spreadsheet then this sort of thing is very convenient as you can easily plot graphs of the combinations of linear and logarithmic scales for each variable. It's very handy to do this sort of thing because it can often show you a straight line for one of the graphs. Get Into Spreadsheets!

Dear

Thank you for your explanation , it is too easy explanation.

but I was wondering if I should take log to the final results go the growth rate and laser intensity only or I should take the log over all internal calculation to get the growth rate?

Waiting for your answer.

Thank you

Last edited by a moderator:

- #5

Science Advisor

Gold Member

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Dearhttps://www.physicsforums.com/threads/logarithmic-scale-for-the-laser-intensity.883345/members/sophiecentaur.199289/ [Broken],

Thank you for your explanation , it is too easy explanation.

but I was wondering if I should take log to the final results go the growth rate and laser intensity only or I should take the log over all internal calculation to get the growth rate?

Waiting for your answer.

Thank you

If you know the law, connecting variables then you can choose correctly. If not then just try all the combinations. You should seriously consider getting into spreadsheets, over 30 years ago, a colleague urged me to use one ( on a BBC Micro!). They are available everywhere and make it so easy to experiment with data.

Much more use and at least as much fun as a computer game. [emoji4]

Last edited by a moderator:

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