This problem is much like the others we have done yet there were a surprising number of incorrect answers. The basic points were covered in a set of classnotes but are repeated here. Gamma ray, uv, blue, red, radio A21. The red and blue beams are reflected at the SAME angle. True c. False A24.
Electromagnetic waves involve oscillating electric and magnetic fields.
Imagine walking under the dome of stars. To turn your gaze N, the stars must move counterclockwise around the Pole Star or they are NOT fixed. In 3 hours the line connecting the Pole Star and stars A and B will be vertical, i.e., A and B will be below the Pole Star which does not move relative to your horizon. In 9 hours, B and A will be off to the right of the Pole Star. The difference is due to the fact that we orbit the Earth or, equivalently, the Sun moves around the celestial sphere on a path called the ecliptic.