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.

Initially, the balloon had 3.0 liters of gas at a pressure of 400 kpa and was at a temperature of 294 k. if the balloon is cooled to 277 k and its volume decreased to 1 l, what will the new pressure in the balloon be?

What is the volume of the fluid in the graduated cylinder with accuracy and measured to the correct degree of precision? 41.2 ml 42.0 ml 41.23 ml 41.89 ml

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.