Which statement describes an example of constructive interference? A. Two TV signals reach an antenna and cancel each other out.
B. Light forms bars on a surface after passing through two slits.
C. Oil spilled in a water puddle shows different colors of light.
D. A cell-phone signal is lost when you pass through a certain area.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.