What Makes Radiation Significant?

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Homework Help Overview

The discussion revolves around the significance of radiation, particularly focusing on equations related to received and emitted power in a steady state. Participants are exploring concepts related to thermal radiation and the implications of temperature on power emission.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants inquire about the understanding of specific equations, such as the relationship between received power and emitted power. There are questions regarding the correctness of the equations presented and the implications of formatting errors in the text.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the equations and their interpretations. Some have expressed confusion about the accuracy of the equations, while others have pointed out potential formatting issues that may affect understanding.

Contextual Notes

There is mention of the original poster being a secondary school student, indicating a possible gap in familiarity with the subject matter. Additionally, there are references to formatting errors in the equations that may have contributed to misunderstandings.

Leo Liu
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Homework Statement
It is a question from 2000 SIN exam, the solution does not make sense to me. I would like to know if someone can explain it, many thanks!
Relevant Equations
P=AT^4
242258
242260
 
Last edited:
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Welcome to the PF.

How would you approach the problem? We need you to show your efforts before we can offer tutorial assistance.
 
It would help if you could indicate what part is not making sense to you.
Do you understand that the received power is FA sin(θ)?
Do you understand that if the absolute temperature is T then the emitted power is 2AσT4?
Do you understand that the two will be equal in steady state?
 
berkeman said:
Welcome to the PF.

How would you approach the problem? We need you to show your efforts before we can offer tutorial assistance.
Sorry. Since I am a secondary school student, I am unfamiliar with this question. Now I undserstand that the equation on the exam was wrong, thank you very much.
 
haruspex said:
It would help if you could indicate what part is not making sense to you.
Do you understand that the received power is FA sin(θ)?
Do you understand that if the absolute temperature is T then the emitted power is 2AσT4?
Do you understand that the two will be equal in steady state?
I find out the equation was incorrect, thank you and have a good day.
 
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Leo Liu said:
I find out the equation was incorrect, thank you and have a good day.
In what way? It looks right to me. Who says it is wrong?
 
haruspex said:
In what way? It looks right to me. Who says it is wrong?
242264
 
Leo Liu said:
View attachment 242264
Ah, that equation. I thought you meant the one in the answer.

If you look carefully at the way it is printed you will see there is a suspicious extra blank between the A and the T, and again in "constant =". Seems the text went through a processing stage that couldn't handle Greek characters. Likewise, none of the superscripting works.

Watch out for the same errors in the other questions.
 
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