How to calculate Laws of Thermal Radiation

Click For Summary
SUMMARY

The discussion focuses on calculating the power emitted per square meter and the dominant wavelength of electromagnetic radiation from Star X, which has a surface temperature of 10,000 K. The Stefan-Boltzmann Law is utilized to determine power output, while Wien's Law is applied for calculating wavelength. For a black body, the emissivity is considered to be unity, simplifying the calculations. Participants express difficulty in understanding the application of these laws and how to input the formulas into a calculator.

PREREQUISITES
  • Understanding of the Stefan-Boltzmann Law
  • Familiarity with Wien's Law
  • Basic knowledge of black body radiation concepts
  • Ability to use scientific calculators for formula input
NEXT STEPS
  • Research the Stefan-Boltzmann constant and its application in thermal radiation calculations
  • Learn how to apply Wien's Law for calculating peak wavelength of radiation
  • Explore the concept of black body radiation and its significance in astrophysics
  • Practice using scientific calculators for inputting and solving physics formulas
USEFUL FOR

Students in physics courses, astrophysicists, and anyone interested in understanding thermal radiation and its calculations.

JayWilks
Messages
2
Reaction score
0
1. Star X has a surface temperature of 10,000 K. How much power does it emit per square meter? Enter numbers only. Do not enter units (watt/m2 is assumed)
2. Star X has a surface temperature of 10,000 K. What is the wavelength of the dominate electromagnetic radiation that Star X emits? Enter numbers only. Do not enter units (nanometers, nm is assumed)
I know that I'm supposed to use Stefan-Boltzmann Law for the first question and Wien's Law for the second but I have no idea on how to go about it. Any help would be truly appreciated
 
Physics news on Phys.org
Radiation emitted is computed for things here on Earth by multiplying the absolute temperature to the 4th power by the Stephan-Boltzmann constant and the emissivity. If you assume the star is a black body, the emissivity is unity.
 
LawrenceC said:
Radiation emitted is computed for things here on Earth by multiplying the absolute temperature to the 4th power by the Stephan-Boltzmann constant and the emissivity. If you assume the star is a black body, the emissivity is unity.

I was doing okay in this course until this lesson. I am taking this class online and this all seems way over my head, even what you just stated to me I'm having a hard time understanding. I think I found the formulas to get my answers but I don't know how or if they can be inputted to a calculator.
 

Similar threads

What Are the Differences Between Black Body Radiation Formulas?
  • · Replies 5 ·
Replies
5
Views
2K
Power Radiated From a Copper Cube
  • · Replies 3 ·
Replies
3
Views
1K
Thermal radiation lab experiment
  • · Replies 5 ·
Replies
5
Views
4K
How Do Two Disks in Vacuum Reach Thermal Equilibrium Under Constant Heat?
  • · Replies 2 ·
Replies
2
Views
2K
How Does Newton's Law of Cooling Affect Heat Loss Calculations?
  • · Replies 2 ·
Replies
2
Views
2K
How to calculate the size of a star with just temperature
  • · Replies 3 ·
Replies
3
Views
2K
Space Shuttle, thermal energy transfer, book makes no sense
  • · Replies 38 ·
2
Replies
38
Views
5K
Question on how much intensity of light has been scattered
  • · Replies 4 ·
Replies
4
Views
2K
Power of radiation received by a surface
  • · Replies 10 ·
Replies
10
Views
2K
Calculating Thermal Radiation: Power and Wavelength of a 47000K Object
  • · Replies 3 ·
Replies
3
Views
2K