Use the drop-down menus to complete each sentence. the mass of the cylinder is manipulated. this is the variable. the temperature of the water changes as the mass of the cylinder changes. temperature of the water is therefore the variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the system that is held constant is the .

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.