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Blackbody energy detector, from Liboff's QM

  • Thread starter cstalg
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  • #1
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Homework Statement



Problem 2.11 of Liboff's Introductory Quantum Mechanics, 1st edition

Suppose that you are inside a blackbody radiation cavity which is at temperature T. Your job is to measure the energy in the radiation field in the frequency interval [tex]10^{14} [/tex] to [tex] 89 \times 10^{14}[/tex] Hz. You have a detector that will do the job. For best results, should the temperature of the detector T' be T' > T, T' = T, T' < T, or T' = 0; or is the temperature of the detector irrelevant to the measurement?


Homework Equations


There seems not lots of calculation.


The Attempt at a Solution


I've no idea how such a detector works. Dose it look like a blackbody itself which absorbs the radiation in the cavity?
 

Answers and Replies

  • #2
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Your attemp at a solution is halfway to the answer. Keep asking "what if."

The detectors work by absorbing a quantum and converting that event into a signal.
 
  • #3
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I think the temperature of the detector should be as low as possible, so that no thermal noise will disturb the observation. So it's T'=0. Is that right?
 

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