Can someone help me plz?? Research two natural and two artificial resources for radioactivity, make sure to include three things. 1) Is the product useful or dangerous? 2) What do use the products with or where they end up? 3) The amount of products released.

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.