An experimenter changes the independent variable (mass) from 450 g to 900 g in consecutive trials of his investigation. As a result, he notices that the dependent variable (time) changes, also, from 1.32 s to 0.72. (see table) What is the corresponding factor change in the dependent variable? (Provide your answer to the hundredths place.)

While standing outdoors one evening, you are exposed to the following four types of electromagnetic radiation: yellow light from a sodium street lamp, radio waves from an am radio station, radio waves from an fm radio station, and microwaves from an antenna of a communications system. rank these type of waves in terms of increasing photon energy.