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Waves having energy with no mass 
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#1
Aug714, 02:41 PM

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Waves have energy without mass which can't be true in Einstein's equation
E=mc^{2} If you work out that E=0 (mass of waves) times 300,000 c^{2} then its zero. Please can someone tell me why waves can have energy but without mass which in einstein's equation cannot be right. Thank you Scimaster 


#2
Aug714, 02:50 PM

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#3
Aug714, 02:53 PM

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PF Gold
P: 1,427

$$ E^2 = (p c)^2 + (m c^2)^2 $$ I guess that when you talk about "waves without mass," you mean light (photons). Photons have momentum, ##p^2 >0 ##, so ##E^2 > 0##. 


#4
Aug714, 03:05 PM

P: 2

Waves having energy with no mass
I was talking about Gamma rays where they have energy without mass



#5
Aug714, 03:08 PM

Sci Advisor
PF Gold
P: 1,427




#6
Aug714, 03:47 PM

Mentor
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