(a) Electromagnetic radiation at temperature Ti fills a cavity of volume V. If the volume of the thermally insulated cavity is expanded quasistatically to a volume 8V, what is the final temperature If? (Neglect the heat capacity of the cavity walls. ) (b) Electromagnetic radiation at temperature T; fills a cavity of volume V. If the radiation undergoes a free expansion to volume 8V, what is the final temperature If? Assume the cavity is thermally insulated, and neglect the heat capacity of the cavity walls. (c) Why is the final temperature in (a) greater than the final temperature in (b)