1. The problem statement, all variables and given/known data OK, so this is a very basic question but i am uncertain what the relationship is. I know its logarithmic, but i don't know how to draw a conclusion. Here is the question: If you want an amplifier which will give a sound output which is twice as lod as your present 20 W amplifier, what amplifier power should you buy? What if you wanted a sound output four times as loud? 2. Relevant equations 3. The attempt at a solution I know that the relationship between Intensity and Wattage is logarithmic, but how do i draw a numeric conclusion?
Are they looking for loudness or intensity? The wattage of the amplifier is the maximum power it can supply to the signal. The intensity a wave is the square of it's amplitude. I suspect you are thinking of decibels. If you double the amplitude, you get four times the intensity.