Answer Happy

a 27. What is the OUTGOING radiation rate of an object with a surface area of 4 m2 a total emissivity of 0.58038, and a surface temperature of 43 °C? a. 3.81 x 10' w b.2.36 x 100 W c. 1.31 x 10° w d. 3.02 x 10 W 28. What is the NET radiation rate of this object if the ambient temperature 20 °C? a. 582 W b. 719 W C. 342 W d. 103 W 29. What is the NET radiation rate of this object if the object's surtace temperature is raised to 363°C, and the ambient temperature is still 20 °C? a. 2.88 x 104 w b. 2.06 x 10* W C. 3.91 x 104 w d. 4.73 x 10 W 30. Using Wien's Law (with the constant equal to 2,897 768 nm K), what is the wavelength of peak radiation for the object at 363°C? (assuming for the moment that the peak wavelength is not effected by the emissivity characteristics) a. 1.32 x 10 nm 5.6.83 x 10 nm c. 4,56 x 103 nm d. 1.09 x 104 nm 31. How does this peak compare with visible light? (The visible spectrum is 380 to 700 nm) a. Its in the X-ray range, not the visible b. Its in the visible c. Its in the ultrviolet, not the visible d. Its in the infrared, not the visible