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*Reverberation time graph*

The Java source code of this applet and its documentation are freely available.

**Notes:**

A program draws a reverberation time(RT60) graph of a certain room at different frequencies.

The algorithm is based on the following formula:

**RT60 = k * (V/Sa)**

*k* is a constant that equals 0.161 when the units of measurement are expressed in meters and 0.049 when in feet. **V** is the volume of a room, **Sa** is the total surface absorption of a room which is a sum of all the surface areas multiplied by their repective absorption coefficients. The absorption coefficients can be obtained from the *Table of absorption coefficients.*