Now look at the view from above when the sound frequency is increased in 1 kHz increments.

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.

 

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© T G Leighton 2004