Please help quickly its for my exam lol. Find the potential difference and then please explain it in b.

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.

What happens in a global convection cell

Amira pulls a 3 pound wagon 4 feet. how much work has she done?