Sand is made of tiny pieces of rock that have been worn down by wind and water. explain why the formation of sand is a physical change.

Why do electron microscopes have higher resolving power than light microscopes?

Place me with this question is my last question

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.