I want the answer pls

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.

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.