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Q & A: light mass, momentum, energy

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Most recent answer: 07/05/2015
Q:
P=mvIf it is true how can light have P i.e. momentum 0+without m i.e. mass =0. Thenlight shold have 0 momentum and 0 energy by E=mc^2 + pc
- Sandeep Kumar Dash (age 12)
kalpakkam, Tamil Nadu, India
A:

This is a question we get very frequently. I'm surprised you didn't find the answer:  .

There is one important comment to make on your question. The correct equation is

E2=(m0c2)2+p2c2, not the one you gave.

Mike W.


(published on 07/05/2015)

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