Inside a closed furnace held at a temperature | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The emissive power of the black body at temperature $T = 400\, K$ is given by the Stefan-Boltzmann law: $E = \sigma T^4$.Substituting the values:

Vedclass · Accepted Answer

The black body will appear brighter than the furnace

Vedclass · Answer

(C) The emissive power of the black body at temperature $T = 400\, K$ is given by the Stefan-Boltzmann law: $E = \sigma T^4$.Substituting the values: $E = 5.67 	imes 10^{-8} 	imes (400)^4$.$E = 5.67 	imes 10^{-8} 	imes 2.56 	imes 10^{10} = 5.67 	imes 256 = 1451.52\, W/m^2$.However,the intensity of the incident sunlight is $I = 2000\, W/m^2$.Since the incident intensity $I$ is greater than the emissive power $E$ of the black body at $400\, K$,the black body will absorb more energy from the sunlight than it emits at its current temperature.In the steady state,the black body will reach a higher temperature than the furnace to balance the energy,making it appear brighter than the furnace.

Inside a closed furnace held at a temperature of $400\, K,$ we have a black body. $A$ hole of area $10\, cm^2$ is opened in the furnace so that sunlight starts falling on the black body. The intensity of sunlight is $2000\, W/m^2.$ In the steady state:

Similar Questions

Which of the following is best close to an ideal black body?

For an opaque body,the coefficient of transmission is:

Good absorbers of heat are

Compared to a white-skinned person,what does a dark-skinned person experience?

Half part of an ice block is covered with a black cloth and the rest half is covered with a white cloth,and then it is kept in sunlight. After some time,the clothes are removed to observe the melted ice. Which of the following statements is correct?

Vedclass Test Series

Exam Paper Generator

Online Exam Module