5.7. Black Body Radiations

Try these first

1. 1.

   What is a black body?

   Hint

   Think about properties of absorption and emission.

2. 2.

   What does Wien’s Displacement Law describe?

   Hint

   Consider how temperature affects wavelength.

3. 3.

   What does a black body do?

   • Reflects all radiation
   • Absorbs all radiation
   • Partially absorbs radiation

   Hint

   Think about the definition of black body.

4. 4.

   Wien's Displacement Law states that as temperature increases, the peak wavelength of emitted radiation...

   • True
   • False

   Hint

   Consider the inverse relationship.

5. 5.

   If an object is heated from 300K to 600K, calculate the factor by which the emitted energy increases using the Stefan-Boltzmann Law.

   Hint

   Remember to compare T^4.

6. 6.

   Using Wien's Displacement Law, predict the peak wavelength emitted by an object at 500K.

   Hint

   Ensure units are consistent while calculating.