Blackbody Radiation

10 Questions | Total Attempts: 250

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Blackbody Radiation

In these questions, you will use the Blackbody Spectrum Simulation to investigate how the spectrum of electromagnetic radiation emitted by objects is affected by the object's temperature. In this simulation, you can input the temperature and observe the spectrum of the radiation emitted.


Questions and Answers
  • 1. 
    • A. 

      200

    • B. 

      2000

    • C. 

      4000

    • D. 

      8000

  • 2. 
    If we observe a stars spectrum and find that the peak power occurs at the border between blue and ultraviolet light, what is the surface temperature of the star? (in degrees C) 
    • A. 

      200

    • B. 

      2000

    • C. 

      3000

    • D. 

      7000

  • 3. 
     Light bulbs operate at 2500 degrees C.  What is the wavelength at which the most power is emitted for a light bulb operating at 2500 C?
    • A. 

      200 nm

    • B. 

      600 nm

    • C. 

      1200 nm

    • D. 

      6000 nm

  • 4. 
    • A. 

      Yes

    • B. 

      No

    • C. 

      It's on the border

  • 5. 
    1. At what temperature is the most efficient temperature, in Celsius for visible light? 
    • A. 

      1000

    • B. 

      2250

    • C. 

      3500

    • D. 

      4500

    • E. 

      5500

  • 6. 
    Investigate how the observed spectrum responds to changing temperature. Note you are only able to change temperature here, but should consider how the spectrum (power vs. color) would change if you varied other characteristics about the object.  If the only change you make is to decrease the temperature of an object, the amount of power emitted at 1000 nm will increase in some cases
    • A. 

      True

    • B. 

      False

  • 7. 
    If the only change you make is to decrease the temperature of an object, the total amount of power emitted decreases in all cases.
    • A. 

      True

    • B. 

      False

  • 8. 
    Use the Spectrum Simulation to investigate changes in the amount of light at visible wavelengths due to this change in temperature from 2500 C to 2000 C. What is the approximate ratio between the powers emitted at 500 nm at 2000 degrees C to that at 2500 degrees C, that is, the power emitted at 500 nm at 2000 degrees C divided by the amount of power at 500 nm at degrees 2500 C? 
    • A. 

      2 to 1

    • B. 

      5 to 1

    • C. 

      11 to 1

    • D. 

      100 to 1

  • 9. 
    What is the approximate peak wavelength for a bulb operating at 2000 degrees C? 
    • A. 

      200 nm

    • B. 

      400 nm

    • C. 

      800 nm

    • D. 

      1200 nm

    • E. 

      1400 nm

  • 10. 
    Evolution is about the most efficient species for area will survive, so most life on the earth see in the same visual spectrum.  If life was to developed in a solar system with a red giant (3000 C)  instead of a yellow star (5700 C)
    • A. 

      There would be no different in the visual light they would see

    • B. 

      They would see more into the ultraviolet

    • C. 

      They would see more in the infrared