(1)-a self-propagating wave consisting of alternating electric
and magnetic fields

Avehicle accelerates from 0 to 30 m/s in 10 seconds on a straight road

How do you know how many valence electrons an atom has?

Does the distance travelled by an oscillating mass between times t=0 and 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 explanation.