Consider the cavity formed by a cylinder having an opening size of d=10mm and a length of L0=90mm, as shown in the diagram. (a) Find the view factor between the inner surface of the cavity and the opening of the cavity. (b) The effective emissivity c, f f a cavity is defined as the ratio of the radiant power leaving the cavity to that from a blackbody having the area of the cavity opening and a temperature of the inner surfaces of the cavity. Find the effective emissivity of the cavity, e. assuming the inner walls are diffuse and gray with an emissivity of w=0.5, the cavity temperature is Tc=500K and the opening temperature is T0=0K. What is the view factor from the inner suface of the cavity to the opening, F12? F12= Step 2 What is the view factor from the opening to the cavity, F21 ? What is the net radiation heat transfer from the cavity to the opening, in W? q12=W Attempts: 0 of 1 used Step 4 What is the radiation emitted by a blackbody surface with the opening area the temperature of the cavity, in W? qc= What is the effective emissivity of the cavity? eff=