What is Intensity of Ray? Where to Get Info?

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The discussion centers on the equation I\gamma=(\GammaN)/D2, which relates to the intensity of a ray. Participants express difficulty in finding information about this equation and its implications. One user suggests it resembles the concept of irradiance, defined as radiant flux per area. Another contributor connects the equation to the relationship between natural line width, mean lifetime, and Planck's constant, mentioning a specific formula involving full width at half maximum (FWHM). Overall, the thread seeks clarity on the equation's meaning and relevant resources for further information.
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What is this equation I\gamma=(\GammaN)/D2

It is about Intensity of ray.
But I can't find any information about it.
What is it? And where can I get the information?
 
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Hi ATPenergy! :smile:
ATPenergy said:
What is this equation I\gamma=(\GammaN)/D2

It is about Intensity of ray.
But I can't find any information about it.
What is it? And where can I get the information?

I'm not sure, but it looks a bit like irradiance = radiant flux (or radiant power) per area :confused: …

see http://en.wikipedia.org/wiki/Radiant_flux"

what book did you get it from?
 
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Hi,
i think it is the relation between natural line width, mean life time and Planck's constant!
the correct relation which i know (FWHM)*meanlifetime=hbar.
 

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