What does earth's plate mean

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

When a light bulb shines, it gives off light energy and energy. a. heat b. potential c. chemical d. electrical

Which of the following are appropriate acceleration units?