Which of the following may form when an existing star runs out of fuel? select all that apply.
a. red giant
b. black hole
c. white dwarf
d. neutron star e. main sequence star

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.

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false

What quantity do units represent in value