ueveiopeu vaiue.1.5) Fill in the blanks: A body whose surface properties are independent ofis. The emissivity of awavelength is said to be aone for all wavelengths, the emissivity of ais between zero andone.

Answered: Image /qna-images/answer/5ab58452-2bed-4f8a-914c-ffe63293263e.jpg

Answered: 1.5) Fill in the blanks: A body whose…

1.5) Fill in the blanks: A body whose surface properties are independent of wavelength is said to be a one for all wavelengths, the emissivity of a is is between zero and The emissivity of a one.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Determine the following: a. Average emissivity of both surfaces b. Absorptivity of both surfaces c. reflectivity of both surfaces d. which surface is more suitable to serve as a solar absorber?
An opaque surface at 1000 K if its spectral emissivity is = 0.4, 0.7, and 0.3 for 0 < < 2 µm, 2μm < 6 μm, and 6um
The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 um. If the peak wavelength of emitted radiation changes to 2.90 um, then the temperature (in K) of the black body is A. 500 B. 1000 C. 4000 D. 8000
Irradiation on a semi-transparent medium is at a rate of 640 W/m². If 160 W/m² of the irradiation is reflected from the medium and 130 W/m² is transmitted through the medium, 1) Determine the absorptivity of the medium. 2) Determine the reflectivity of the medium. 3) Determine the transmissivity of the medium.
TEOLOG Q1(a): Taking X as the lowest view point, sketch the isometric view of the part. NERST TEKNOL
Two point sources of coherent light with a wavelength of 700 nm are near each other. The light from these sources is interfering in space around them. If you determine there is destructive interference between the two sources at a point 70.35 μm away from the second source, how far away from this point might the first source be? (Note that the image shown is not drawn to scale.) Source 1 74.20 μm o 77.175 um - 80.85 um ○ 80.85 μm 80.85 μm ? Source 2 70.35 μm destructive interference here
A small 100 cd spring is located in the center of a spherical mirror with a diameter of 10 cm and a focal length of 50 cm. Assuming that the total reflectance is about 80%, obtain the average brightness of the parallel beam reflected from the mirror.
Question 30 of 30 く - / 4.3 View Policies Current Attempt in Progress Two concentric spheres of diameter D = 0.8 m and D2 = 1.2 m are separated by an air space and have surface temperatures of T = 410 K and T2 = 300 K. (a) If the surfaces are black, what is the net rate of radiation exchange between the spheres, in W? 912 = W (b) What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with &j = 0.5 and ɛ2 = 0.05, in W? 912 = i W (c) What is the net rate of radiation exchange if D2 is increased to 20 m, with ɛ2 = 0.05, ɛ = 0.5, and D = 0.8 m, in W? 912 = W (d) What is the net rate of radiation exchange if the larger sphere behaves as a black body (ɛ2 = 1.0) and with &j = 0.5, D2 = 20 m, and D = 0.8 m, in W? 912 = i W Physical Properties Mathematical Functions II
You have stated that the convective area is πr^2. Please explain this. πr^2 is the area for a circle, not a sphere. It should be 4πr^2 as this is equal to the surface area of the sphere as you have done correctly in the radiative area. A conv= 4πr^2*3*293-292 = 0.377 A rad = 4πr^2*0.2*5.67x10^-8*(292^4-291^4) = 0.144 I have tried to multiply the convective area by 4πr^2 instead of πr^2 but it is giving me an incorrect total heat transfer rate of 0.377+0.144 = 0.521 the correct answer is supposed to be 0.236
The speed of sound in air is 340 m/s, and the speed of light is 3.0 X 108 m/s. What frequency oflight has the same wavelength as a 200.0 Hz sound wave?
es Check my work Required information Irradiation on a semi-transparent medium is at a rate of 610 W/m2. If 160 W/m2 of the irradiation is reflected from the medium and 130 W/m2 is transmitted through the medium, Determine the absorptivity of the medium. The absorptivity of the medium is.
A furnace has the shape of a cylinder and has R = H = 2m as its dimensions. The temperatures on the base, top, and side surfaces of the furnace are kept constant at 500, 700, and 1200 K accordingly. All three surfaces are black. Determine the net rate of radiation heat transfer from or to the top surface when the system is operating at a steady state.