photonxiii
Newly Enlightened
- Joined
- Sep 12, 2007
- Messages
- 33
I came across a rather informative laser pointer review from an astronomer/teacher. Here's part of the article:
"Here is what this means. Let's assume the laser gives off photons only in 532nm light (energy per photon = hc/532nm = 3.7×10^-21 J). This means the laser gives of 4.3×10^19 photons per second (# photons/sec = 160mW/(energy per photon)/sec). If you stood in front of the laser, 1 km away from the laser, 1~/10,000 of the laser's light would enter the 7mm diameter opening in your eye, nailing your retina with ~0.002mW of energy."
Nicely put in layman's terms...for me anyway.
You can view it here if you want to read more about it: www.starstryder.com
Interesting read...just let "goober" slide... (you'll know what I mean when you read the article) :nana:
"Here is what this means. Let's assume the laser gives off photons only in 532nm light (energy per photon = hc/532nm = 3.7×10^-21 J). This means the laser gives of 4.3×10^19 photons per second (# photons/sec = 160mW/(energy per photon)/sec). If you stood in front of the laser, 1 km away from the laser, 1~/10,000 of the laser's light would enter the 7mm diameter opening in your eye, nailing your retina with ~0.002mW of energy."
Nicely put in layman's terms...for me anyway.
You can view it here if you want to read more about it: www.starstryder.com Interesting read...just let "goober" slide... (you'll know what I mean when you read the article) :nana:
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