2. The length of a day is based on the amount of time that
a. Earth takes to orbit the sun one time
b. Earth takes to rotate once on its axis
c. The moon takes to orbit the Earth one time
d. The moon takes to rotate once on its axis.

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.