Between 116-118 kHz you might think that the sonoluminescence increases with
frequency.
But if you were only to look between 126-128 kHz, you might think that the
luminescence
decreases with frequency.
If you look through the whole range of 116-130 kHz, you see that a 1 kHz
change can make difference, either increasing or decreasing luminescence:
Look at the effect of going from 121-123 kHz !
So the usual method of making jumps of 100 kHz or more clearly misses the
detail of what is going on, and conclusions about the ‘optimal’ frequency for
sonochemistry can be misleading.
