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4. . Find the work for an isochoric process. . Find the work for an isobaric process. 5. Show that for a Carnot' cycle, the efficiency can depend only on the temperatures of the heating and cooling bodies and does not depend on which gas is used as the working gas. 1 PHY 111 Summer 2022 6. Perfectly black hot surface is kept at a constant temperature Th. There is another perfectly black cold surface which is parallel to the first one, and is kept at a constant temperature Ti ; there is a vacuum in the space between the plates. In order to reduce the heat flux between the plates, a screen is used, which is made of N parallel thermally insulated perfectly black plates (in the figure, N = 2). Such a screen is placed between the hot and cold plates, parallel to them. By which factor x will the heat flux be reduced once a thermal equilibrium is reached? The edge effects caused by the finite size of the plates can be neglected. Th Ti