- #1
Erathsmus
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"Thus, matter can be created out of two photons."
Hello, and thank you for opening my thread!
I have read over the FAQ on this forum, looked over a few similair topics, and still feel that I lack understanding with this concept.
To me, the wiki stated below sounds like it is saying light + light can = mass.
On this Wiki page, it states "Thus, matter can be created out of two photons."
http://en.wikipedia.org/wiki/Matter_creation
On this page as well, they describe a collision with electrons and photons to produce matter from light itself. But I do not know whether the mass of the new particle created was greater than the mass of the electron. In other words, does this electron to proton collision produce a mass greater than the electron initially used?
http://www.sciencedaily.com/releases/1997/09/970918045841.htm
So by this, even though photons do not have mass, they can be collided to make something with mass?
Another concept I am having trouble with is the following:
"she slowed light, which travels in free space at a speed of 186,000 miles a second, to just 38 miles per hour in a cloud of ultracold atoms. Einstein and others have theorized that the speed of light in free space can't be changed"
From: http://www.photonics.com/Article.aspx?AID=28520
I thought the speed of light is to be considered a constant? How can they slow this down, or even stop it? And when stopped, what does this light become?
Thank you all for your help, it is much appreciated.
Hello, and thank you for opening my thread!
I have read over the FAQ on this forum, looked over a few similair topics, and still feel that I lack understanding with this concept.
To me, the wiki stated below sounds like it is saying light + light can = mass.
On this Wiki page, it states "Thus, matter can be created out of two photons."
http://en.wikipedia.org/wiki/Matter_creation
On this page as well, they describe a collision with electrons and photons to produce matter from light itself. But I do not know whether the mass of the new particle created was greater than the mass of the electron. In other words, does this electron to proton collision produce a mass greater than the electron initially used?
http://www.sciencedaily.com/releases/1997/09/970918045841.htm
So by this, even though photons do not have mass, they can be collided to make something with mass?
Another concept I am having trouble with is the following:
"she slowed light, which travels in free space at a speed of 186,000 miles a second, to just 38 miles per hour in a cloud of ultracold atoms. Einstein and others have theorized that the speed of light in free space can't be changed"
From: http://www.photonics.com/Article.aspx?AID=28520
I thought the speed of light is to be considered a constant? How can they slow this down, or even stop it? And when stopped, what does this light become?
Thank you all for your help, it is much appreciated.