If a black body at 1000 K and a gray body at 1250 K emit the same amount of radi

Question

If a black body at 1000 K and a gray body at 1250 K emit the same amount of radiation, what should be the emissivity of the gray body?

Options:

A . 0.3096

B . 0.4096

C . 0.5096

D . 0.6096

Answer: Option B
Answer: (b).0.4096

Was this answer helpful ?

Next Question

More Questions on This Topic :

Question 1. The radiant heat transfer from a plate of 2.5 cm² area at 1250 K to a very cold enclosure is 5.0 W. Determine the e....W. Determine the emissivity of the plate at this temperature

Question 2. The emissivity of the gray surface may be expressed as....

Question 3. When the emissivity of non-black surface is constant at all temperatures and throughout the entire range of wavelength, ....throughout the entire range of wavelength, the surface is called

Question 4. A polished metal pipe 5 cm outside diameter and 370 K temperature at the outer surface is exposed to ambient conditions ....heat transfer by the combined mode of convection and radiation

Question 5. Transmissivity is defined as....

Question 6. A body through which all the incident radiations passes, is called....

Question 7. With respect to incident radiation, transmissivity varies with....

Question 8. Radiant energy with an intensity of 800 W/m² strikes a flat plate normally. The absorptivity is thrice the reflecti....reflectivity and twice the transmissivity. Determine the rate of transmission

Question 9. Which one is having lowest value of solar absorptivity?....

Question 10. What is the value of solar absorptivity for snow?....

Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)

Direction Sense Test Part 1 Reasoning (Hindi)

Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE

Cube & Cuboid Part 1 Reasoning (Hindi)

Data Interpretation (DI) Basic Concept Reasoning (Hindi)

Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)

Sail E0 free webinar Webinars

Real Numbers Part 7 Class 10 Maths

Real Numbers Part 1 Class 10 Maths

Polynomials Part 1 Class 10 Maths

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI

Tabulation - Test Paper 2 Data Interpretation Reasoning & DI

Test Paper 1 Direction Sense Test Reasoning & DI

ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0

GFM Combined 1 Free Revision Test SAIL JO E-0