Did light travels in particles or waves?

Question

Last year my physics class my profesor told me tha light travel in waves an particle but i didint get it!

Answer 1

wave partcle duality. it is some crazy quantum theory that all particles act as both a wave and a particle.

everything but the photon is hard to comprehend, so think of it like this. a stream of individual pulses of electromagnetic radiation. constantly being emmited in the form of light.

Answer 2

Light is theorized to travel as both a wave and a particle. These seemly conflicting theories have each been tested true, which only illustrates the complex nature of light. Furthermore, electrons have been shown to exhibit the same duality, as a particle and a wave. Until scientists come up with a definitive description of what light is, a wave, a particle, or both, or neither, then the debate remains open.  

Answer 3

Light...  it's ENERGY...  that's what we know it to be.  

as for a particle or wave.. it depends how you want to study it.. how you want to look at it.

If you try to study it a certain way, say in diffraction or refraction, then light exhibit wave like properties.

but if you study it in a different way.. say photoelectric effect, or blackbody radiation... then it shows particle-like characteristics.

Note they are CHARACTERISTICS only... and we use this to try and get a picture of light.   In the end, the best acceptable answer is light is a packet of energy, which travels at speed c.  It can show either it's wave nature, or particle nature..., never both at one time, and which ever nature it shows depends on how and with what instruments you use to test or study it.