How is a line spectra created from a hot gas? A. Photons are emitted when the amount of radioactive material in the gas decreases by half.
B. Ionizing radiation knocks electrons out of an atom and they transform into photons.
C. Current flows through a filament and heats it up causing photons to be emitted.
D. When electrons drop down from a high energy level they emit a photon.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?