A metal's luster is due to . A. the free flow of electrons between its atoms
B. Light energy being absorbed and given off again by its valence electrons.
C. Energy from the nuclei of its atoms being given off as a visible light
D. Valence electrons giving off energy as they collide with one another.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Which fact represents evidence for the big bang theory?

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.