Which of the following is an example of diffraction

Which is mostly likely why many scientists reject the cold fusion theory

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount