Which BEST compares the motions of dots Cand D? A)
Both Cand D are speeding up.
B)
Both C and D are moving at a constant velocity
Cis speeding up and D is moving at a constant velocity.
D)
Cis slowing down and D is moving at a constant velocity.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.