t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanatio
if the light undergoes refraction at the interface, then the event is described by the rays a and c .
if the light undergoes reflection at the interface, then the event is described by the rays a and b .
oops. i see that these are answers. somehow i must have stumbled onto the set of jeopardy.
'd' is the scalar. it has size but no direction. the other choices have directions too, so those are vectors.