3. In Heat Transfer unit operations one very important Law used is the Stefan-Boltzmann which appliesonly to blackbodies and theoretical surfaces that absorb all incident heat radiation. This states that thetotal radiant heat power emitted from a surface is proportional to the fourth power of its absolutetemperature. This law can be employed to estimate the rate of radiation energy H from a surface by theequationH = AeoT4where H is in Watts, A = surface area (m2), e =the surface (dimensionless), o = a universal constant called the Stefan-Boltzmann constant (= 5.67 x 10- 8 Wm -2K-4), and T = absolute temperature, K.Determine the percent relative true error of H for a steel plate with A = 0.52 m?, e = 0.83, and T = 749+ 25.emissivity that characterizes the emitting properties of

Given: Stefan-Boltzmann formula, H=AeσT4 Area, A=0.52 m2 Stefan-Boltzmann constant, σ=5.67×10-8…

Answered: 3. In Heat Transfer unit operations one…

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The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).
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