Which of the following is found in large quantities in the earth’s crust?
silicon
nickel
iron
magnesium

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

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.