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- a) Define Stefan-Boltzmann Law and emissivity. b) Is there any surface whose emissivity value is greater than 1? If no, explain the reason.Q#01:a) Define Radiation and give at least 3 examples.b) Define Stefan-Boltzmann Law and emissivity. Is there any surface whose emissivity valueis greater than 1? If no, explain the reason.Define Emissivity of some materials at 300 K.
- 6. Suppose that next week there is a news report that oxygen has been observedin the spectrum of an extra-solar planet. Would you believe it? What would this discoveryimply?Attached is the question and the formula to solve it. I attached the formula directly from the book, the Blackbody radiation Pressure formula that is. Thank you :)The emissive power of a black body depends on the fourth power of the temperature and is given by W = A T4 Where, W = emissive power, BTUs per square feet per hour A = Stefan Boltzmann constant, 0.171 x 10-8 T = temperature,° Rankine what is the value of A units in J/(m2.
- 6. The equation for the temperature profile inside a solid cylinder with heat source is: В. Т-Т, A. T = T, =1-(-) T-T %3! 2k C. D. None of them T-T, = (R -r) 2k 7. For surface of very large area, A. radiosity (J)=0 C. Eb=J B. The emissive power of a blackbody Eb=1 D. Eb 0Discuss the principle of accelarationQ2:- Light from the sun arrives at the earth, an average of 1.48 x 101' m away, at the rate of 1.4 kW/m2 of area perpendicular to the direction of the light. Assume that sunlight is monochromatic with a frequency of 4.95 x 1014 Hz. (a) How many photons fall per second on each square meter of the earths surface directly facing the sun? (b) What is the power output of the sun, and how many photons per second does it emit?