4. When electromagnetic radiation (light) is produced it usually takes two steps. One will be an endogonic step (endogonic=endothermic) and another will be an exogonic (exogonic=exothermic). These steps are
what you described in both interpretations #1 and #2 above. You are to clearly describe which
step is the endogonic and which is the exogonic. Provide a brief explanation to back up your response.

B"hf and f-"  is the correct answer took the test on edgenuity and got it right     

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.