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Blackbody Radiation (Grades 11-12)

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Blackbody Radiation

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1. 
Planck's law describes the electromagnetic radiation emitted by a(n)                       in thermal equilibrium at a definite temperature.
  1. ideal gas
  2. infinite light source
  3. black body
2. 
What is a blackbody?



3. 
The total energy radiated per unit surface area of a black body across all wavelengths per unit time is called                    .
  1. irradiance
  2. radiant exitance
  3. flux intensity
  4. black body spectrum
4. 
According to the Stefan-Boltzmann Law, the radiant exitance or emissive power is directly proportional to the fourth power of the black body's                          .
  1. kinetic energy
  2. mass
  3. thermodynamic temperature
  4. specific heat
5. 
Explain blackbody radiation.



6. 
For “grey body” radiation represented by the equation, [math]j^"*"=epsilon sigma T^4[/math], what is the value of emissivity, [math]epsilon [/math]?
  1. less than one
  2. equal to one
  3. greater than one
7. 
Explain the significance of the Rayleigh-Jeans Law.



8. 
Explain Wein’s Displacement Law.



9. 
How do modern physicists use Wein's Displacement Law?



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