Compare the rates of emission of heat by perfectly black body at 427°C and 127°C.
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- The triple points of neon and carbon dioxide are 24.57 K and 216.55 K respectively. Express these temperatures on the Celsius and Fahrenheit scales.Satellites designed to observe the radiation from cold (3 K) dark space have sensors that are shaded from the Sun, Earth, and Moon and that are cooled to very low temperatures. Why must the sensors be at low temperature?Rate of cooling of a body is 20C/min at temperature of 600C and 10C/min, when it is at 450C. What will be temperature of surrounding.
- Find the specificheat at 50 degreesusing newton’s cubicmethod ofinterpolationOur sun, currently a yellow dwarf, will eventually evolve to a red giant star and then to a white dwarf star as shown in the figure. Assume that the sun radiates like a blackbody. Calculate the power radiated by the YELLOW DWARF sun if its surface temperature is 5778 K.(1a). Figure shows a copper rod AB being heated at one end. Explain how the heat transfers from A to B. What is the name of this method? copper rod Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 134°F. Radius of Earth is 6390 km. Calculate the total power radiated from the Earth in Watts (W)
- A wire of length 7,6 m and radius 2,5 mm is heated by the electric current to the temperature 1019"C. treating the wire as a perfect blackbody and ignoring any end effects, calculate the radiant power of the wire in kW. Ответ:A horizontal 1-m-square plate electric heater dissipates heat to the atmospheric air at 25oC. The power of the electric heater is 0.5 kW and the average surface temperature of the heater surface is 85oC. Air is forced over the heater surface to transfer a large amount of heat into the air. What should be the air velocity to remove the heat from the heater? Now suppose the heater also radiates like a black surface to surroundings at 25oC? What air flow velocity is required to remove heat from the heater in this case?Suppose that the average speed (vrms) of carbon dioxide molecules (molar mass 44.0 g/mol) in a flame is found to be 2.33 105 m/s. What temperature does this represent? (in K)