Atomic absorption and atomic emission spectroscopy each require a flame to atomize samples. which of the following statements explains which technique requires a more stable flame temperature and why? atomic emission, because a small population of the excited state can vary significantly as the flame temperature is changed atomic absorption, because the sample solution must be vaporized and the sample must be atomized very quickly atomic emission, because the emission intensity is proportional to the concentration of element in the sample atomic absorption, because the hollow-cathode lamp requires a particular energy of ne^+ or ar^+ ions to excite fe atoms

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Which element is least likely to undergo a chemical reaction

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.