Which two statements are true about a system? A: A system is a group of objects analyzed as one unit.
B: Energy that moves across system boundaries is conserved.
C: There’s only one way to define the boundaries of a system.
D: All systems are made by humans.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.