the total power emitted by a Black Body at a temperature of 2000 K with wavelength range A= 1.5 um – ∞ %3D
Q: The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 pm. If…
A: Given, Temperature T1 = 2000 K Peak wavelength of radiation emitted by body at T1 = λ1 = 1.45 μm…
Q: Two concentric spheres of diameter Di = 0.7 mand D2 = 1.2 mare separated by an air space and have…
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Q: A body at 1100ºc in a black surrounding at 550ºc has emissivity of 0.4 at 1100ºc and emissivity 0.7…
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Q: ) Define Stefan-Boltzmann Law and emissivity. b) Is there any surface whose emissivity value is…
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Q: Consider a 20-cm x 20-cm x 20-cm cubical body at 750 K suspended in the air. Assuming the body…
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Q: Calculate the radiation in watts per square centimeter from a block of copper at 200°C and at…
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Q: A small circular surface of area A1=2 cm2located at the center of a 2-m-diameter sphere emits…
A: Given:Surface area of the small circle,A1=2 cm2=2×10-4m2Diameter of sphere(blackbody),D=2mSo ,radius…
Q: Two concentric spheres of diameter D₁ = 0.9 m and D₂ = 1.2 m are separated by an air space and have…
A: Given that: For two concentric spheres, D1 = 0.9 m, D2 = 1.2 m, T1 = 400 K and T2 = 300 K (a)…
Q: How many watts will be radiated from a spherical black body 15 cm in diameter at a temperature of…
A: Given that: diameter of the sphere = 15 cm Temperature = 900 oC It is required to determine energy…
Q: The variations of the spectral emissivity of two surfaces are as given: Surface 1: ɛ1=0.3 0 ≤ λ <…
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Q: Two concentric spheres of diameter Di = 0.7 m and D2 = 1.2 m are separated by an air space and have…
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Q: QUESTION 6: Two parallel disks of diameter D = 0.8 m separated by L = 0.4 m are located directly on…
A: Given Data,D=0.8mL=0.4mT1=T2=450K (black body)T3=300K (black body) i.e us the backside…
Q: The wavelength at which the Sun emits its most intense light is about 550nm. Assuming the Sun…
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Q: Light from an ideal spherical blackbody 15.0 cm in diameteris analyzed by using a diffraction…
A: Given data: The diameter of the black body is d=15 cm The angle is θ=14.4°
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A: A blackbody is an ideal body that can emit or absorb all types of wavelength. The black body has…
Q: The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45…
A: Given data: The temperature of black body is T1 = 2000 K. The peak wavelength of radiation emitted…
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A: Write the expression for the radiation heat transfer through the surface. Now substitute the…
Q: A black body of 0.2 m^2 area has an effective temperature of 800K. Calculate a). The total rate of…
A: Given:Temperature,T=800KArea,A=0.2 m2
Q: The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 um. If…
A: GIVEN DATA - λ1=1.45μm T1=2000K WE HAVE TO CALCULATE TEMPRATURE CORRESPONDING TO 2.90 WAVELENGTH
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A: Given data ε1=0.8,ε2=0.5 Need to determine the emissivity ε3
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Q: Two concentric spheres of diameter D = 0.7 m and D2 = 1.2 m are separated by an air space and have…
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Q: Consider a cylindrical furnace with ro = H = 1 m, as shown in the figure. The top (surface 1) and…
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Q: Define Stefan-Boltzmann Law and emissivity. Is there any surface whose emissivity value is greater…
A: 1. Stefan-Boltzmann Law It defines the rate of heat radiated from a black body in terms of its…
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A: Given Emissivity = 0.8 Radiation intensity, E = 240 W/m2 Find Radiosity, J
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A: Given: The surface temperature, T1 = 3500 K The source temperature, T2 = 3000 K
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A: Black Body We have known that all bodies emit electromagnetic radiation over a range of wavelengths…
Q: Two very large parallel plates are maintained at uniform temperatures T1 = 800 K and T2 = 500 K and…
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Q: A furnace that has a 40-cm * 40-cm glass window can be considered to be a blackbody at 1200 K. If…
A: Given data Area of the glass window = Temperature of the furnace = 1200 K Transmissivity
Q: Two concentric spheres of diameter D = 0.8 m and D2 T1 = 410 K and T2 = 300 K. = 1.2 m are separated…
A: As per our guidelines we are supposed to solve only 3 subparts if multiple subparts are asked .…
Q: A certain surface maintained at 1400 K has the following spectral emissive characteristics: =0.08…
A: From the weins displacement law,
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- 1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure. The gas mixture consists of by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K, calculate (a) the effective emissivity of the gas at its temperature, (b) the effective absorptivity of the gas to radiation from the 1390 K surface, (c) the effective absorptivity of the gas to radiation from the 278 K surface, and (d) the net rate of heat transfer to the gas per square meter of surface area.
- 11.41 Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
- Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5m, 0.6 at wavelengths from 1.5to2.5m, and 0.4 at wavelengths longer than 2.5m. The surface temperature is 1111 K.1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.55. At what net rate does heat radiate from a 275-m² black roof on a night when the roof's temperature is 30.0°C and the surrounding temperature is 15.0°C? The emissivity of the roof is o.900.
- Earth absorbs solar energy and radiates infrared energy. The intensity of the solar radiation incident on earth is J = 1350 Wm-2, also known as the solar constant. Assume earth’s surface (ground) temperature to be uniform at Ts, and that the ground and atmosphere are black (emissivity = 1) for infrared radiation. The radius of the earth is 6.378 x 106 m. The diagram shows the ground at the surface temperature Ts and the atmosphere, represented as a thin black layer, at temperature Ta . Suppose the atmosphere absorbs 100% of the infrared radiation emitted by the ground. Assume that the ground absorbs 47.5% of the incident solar energy, and that the atmosphere absorbs 17.5% of the incident solar energy (for a total of 65% absorbed by the planet). Calculate the "steady state” numerical values of the earth’s ground temperature Ts and the atmospheric temperature Ta taking into account the “greenhouse effect” of atmospheric infrared absorption and emission described above.Q2/A) agray body (ɛ= 0.85) emits the same amount of heat as a black body at 1080 k. find the temperature of the gray bodyThe wavelength at which the Sun emits its most intense light is about 550nm. Assuming the Sun radiates as a perfect blackbody, estimate (σ = 5.6696 x 10-8 W/m2 K4). Find its total emitted power.