### Strutt Help

Ratio of Distances
^{1/1, 1/3}
**Strutt|Propagation|Ratio of Distances**, inserts the ratio of distances correction into the current row of the worksheet, to convert a measured sound level at a known distance (`d_1` to a sound level at a given distance `d_2`)

Strutt implements the formula as:

`Delta L = Clog_10(d_2/d_1)`, where

`C` is a constant and has the value 10 for line source (3 dB per doubling of distance), and has the value 20 for point source (6 dB for doubling of distance).

Comments or suggestions to
strutt@arup.com