44) a long spring is attached to a wall. a student generates a pulse 20cm high. when the pulse hits the wall it bounces back upside-down. if a student creates another 20cm pulse, what will be the effect when the two pulse meet?

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.