Consider an experiment where a Blackbody (Blackbody radiation) is studied. The radiators are heated up by absorbing incident light and cool down when they emit light, reaching a specific temperature at equilibrium. Assume for all parts that the equilibrium temperature of the Blackbody radiator is 8000K. a) How much energy is emitted per second by the blackbody (i.e., what is the power it emits)? What is the nature of emitted energy (hint: the answer is more precise than just saying “heat”)? b) What is the intensity distribution at a frequency of 230x10^12 Hz? Calculate this both for Rayleigh-Jeans and Planck form of the distribution.
Consider an experiment where a Blackbody (Blackbody
a) How much energy is emitted per second by the blackbody (i.e., what is the power it emits)? What is the nature of emitted energy (hint: the answer is more precise than just saying “heat”)?
b) What is the intensity distribution at a frequency of 230x10^12 Hz? Calculate this both for Rayleigh-Jeans and Planck form of the distribution.
c) Is a larger fraction of the energy emitted at a frequency of 230x10^12 Hz for the Rayleigh- Jeans or Planck distribution? Briefly explain why.
d) We will now consider “graybody” radiation, where the graybody object reflects 5% of the light (i.e., it does not absorb all the light incident on it). However, since the absorptivity and emissivity are equal the graybody comes to equilibrium at a temperature of 8000K. What is the energy emitted by the graybody per second at 8000K? Would the changed absorptivity and emissivity change the frequency distribution?
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