Which describes a value for density?

a value for volume, such as mº, divided by a value for mass, such as kg

a value for mass, such as kg, divided by a value for volume, such as mº

a value for distance, such as m, divided by a value for time, such as s

a value for time, such as s, divided by a value for distance, such as m

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.