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- The Earth is spherical in shape and can be considered to be a perfect black body radiator at a temperature of 53°C. Radius of Earth is 6350 km. (consider: Stefan's constant o = 5.67 x 10 W/m?T4) 8 Calculate the total power radiated from the Earth in WattsThe power emitted by a blackbody is proportional to T^4. If the temperature of the blackbody goes from 3000K to 6000K, by how much (by what factor, 2, 3, 8, etc) does the power increase?How much heat, in joules, does the fusion of four protons undergo nuclear fusion to produce an a- particle and two positrons. The mass of the a-particle is 6.64465x10^-27 kg, the mass of the positron is 9.10939x10-^31 kg, and the mass of 4 protons is 1.67262x10^-27 kg. Report your answer in kJ/mol
- A 0.01m long bar of nickel is placed in a laboratory furnace and heated from 25∘C to 500∘C. What will be the length of the bar (in mm) at 500∘C?Q#1 Consider the following pairs of materials: Which pair represents two materials, one of which is twice as hot as the other? (a) boiling water at 100C, a glass of water at 50C (b) boiling water at 100C, frozen methane at-50C (c) an ice cube at -20C, flames from a circus fire-eater at 233C.For a natural gas air flame, calculate the relative intensity of the 589.6nm emission line for sodium at 3.5cm above the orifice(T=1857C) to the line at 1.9cm above the orifice (1700C)
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