Hi Rodd, I don`t want appear to be hypercorrectly but according the following actual formular for half space radition, there are a couple of megawatts missing in Your calculation :The 10% efficient speakers he found would have required 21 Mega Watt of amplification
tschrama said:As a side note:
My textbook teels me this:
20uPa == 0dB... 1Atm = 100E3 Pa so that is 194dB... this is about the maximum sinewave sound presure level you can possible measure...
Thank you , i have been waiting for that !!
And if i understood it all right you have to achive TOTAL vaccum in the process of making that waveform.
Waiting for that day when someone say they play 195 dB sinus waves in a car
However, the space shuttle can get upwards of 200dB, IIRC... (different situation: you have exhaust gasses at who knows what pressure here.) They spray water over the launch pad to damp this so it doesn't shatter the concrete!