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The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?