Urgent help- Q on Loudness/Intensity
I have this horrible question on loudness. It has given me the formula which is:
I also have a table as shown below.
Sound intensity (I) W/m2 Source of Sound
10-12.8 Inaudible to most humans
10-12 Threshold of Hearing
10-11.4 Very Quite Whisper
10-11 Rustle of Leaves
Now they want me to fill in a table which has I, Io and 10Log(I/Io).
I understand that "I" just means 10-11ect. But what is Io?? Now I know that Io is usually taken as 10-12 but that is only for like the softest sound or something..right??
Sorry its a little complicated to read cause of the table but please someone help!!! it will be much appreciated!!!