The first law of thermodynamics says what about the nature of energy?

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.

An object has a weight of 500 on earth what is the mass of this object

If element x has 99 protons how many electrons does it have