[UK-CONTEST] Ultrasound beware!

[Clive Whelan]

Thanks Chris

I certainly didn't know that, and I have to say that I wouldn't have 
dreamt that air molecules could/would move that fast, atoms/electrons 
sure, but gignormous Oxygen and Nitrogen molecules amazing.

Getting a long way OT for here, so better QRT now!

73



Clive


Chris Tran ZL1CT wrote:
> Hi Clive
>
> No need to be concerned - these are not electromagnetic waves, but 
> sound (longitudinal) waves - they travel inside your body at about 
> 1500m/s - the higher frequencies giving better resolution.  They are 
> generally regarded as harmless, however there is some debate about 
> their possible harmful effect on foetus (foetii?)
>
> 73
> Chris
> ZL1CT/GM3WOJ
>