Question

which three characteristics make a glowing piece of charcoal a blackbody radiator?
a. the frequencies of emr it emits depend on its temperature.
b. it emits only one frequency of emr.
c. it emits a range of wavelengths of emr.
d. it absorbs most of the emr it receives.

Explanation:

• A blackbody radiator absorbs all electromagnetic radiation (EMR) incident on it (so D is correct).
• It emits a continuous range of wavelengths of EMR (so C is correct).
• The frequencies (and wavelengths) of the EMR it emits depend on its temperature (so A is correct). A blackbody does not emit only one frequency of EMR (so B is incorrect).

Answer:

A. The frequencies of EMR it emits depend on its temperature.
C. It emits a range of wavelengths of EMR.
D. It absorbs most of the EMR it receives.