On 02/05/2013 18:20, benj wrote:
> On Thu, 02 May 2013 10:51:50 +0100, Martin Brown wrote:
>
>> On 02/05/2013 10:31,
hab...@anony.net wrote:
>>> Moron Jyotish do put a comment at the top , to show that you
>>> have read the article.
>>> One would have thought that the laser would move instatenously
>>> popping all of them at the same time, so why is there a delayed effect
>>> unless it is a fake? Or is it that light is slowed down with each
>>> balloon?
>>>
>>>
http://m.popsci.com/technology/article/2013-05/watch-laser-tear-
> through-100-balloons-one-shot
>>
>> The balloons are black and the laser short wavelength so that it is
>> blocked by the opacity of the balloon until it is popped and out of the
>> way. A near IR CO2 laser would go through them all in one go.
>
> But if the balloons were transparent the light wouldn't pop them. Just
Prof George Porter did that for a Royal Institution Xmas lecture he gave
in the early 1970's. I don't know if the original video survives.
He did pioneering fast laser studies of obscure reactions of CFCs and
was awarded the Nobel prize in 1967 that ultimately turned out to be the
smoking gun mechanism for ozone depletion. He was studying them in
detail more because they were interesting and matched the capabilities
of the ultra-fast (for then) laser kit that he had available.
> tell Habshi that the light is slowed by the balloons he won't know
> better! G=EMC^2 has actually STOPPED light just inches from it's source.
> Oh ya!
You can tell the average raving loon anything and they will believe it.
--
Regards,
Martin Brown