Light Mass

  • #1

Main Question or Discussion Point

I am a lower sixth student and i got into an argument with my physics teacher today when we were talking about the photovoltec effect and he said that light has no mass. I have a very small understanding of the subject compared to him but from what i do understand the uncertanty principle states that light can change the momenteum of something and so it must have mass to have momentium. Also i know that gravity can bend light and this also points out that it must have a mass. His response was that light is just energy until it hits something and then it changes its energy to mass.
I cannot grasp the concept of something existing of pure energy i was wondering if somebody could shed some light on this. Thanks
 

Answers and Replies

  • #2
cristo
Staff Emeritus
Science Advisor
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I recall a new addition to the FAQ regarding this a few days ago. Here's the link: https://www.physicsforums.com/showpost.php?p=1285138&postcount=6 [Broken]
 
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  • #3
Thanks, i understand it now.
 

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