1. An object that absorbs and re-emits all energy that hits it without any reflections is a
__________________.
2. The blackbody radiation from a hot object is (bluer/redder) __________________. than the
blackbody radiation from a cooler object.
3. The hotter the object, the _______________ the wavelength of the peak range of blackbody
radiation emitted.
4. Planck’s Law states that the amount of energy carried by a photon is directly proportional to
its ___________________.
5. The total amount of energy at all wavelengths emitted by a blackbody, per square meter per
second, is proportional to the ____________ power of the its absolute temperature.
6. A plot of a brightness spectrum displays the brightness of radiation received from a source at
various ______________ or ___________________.
7. Electromagnetic radiation from blackbodies, ionized gas, and line emissions from atoms and
molecules can all be generated by ________________ mechanisms.
8. Hot, ionized gases are called ______________.
9. Wavelengths of 21.11 cm are associated with line emissions from ________________
_______________.
10. Because blackbody curves do not cross, if you know the brightness of a blackbody at a given
frequency, you also know its _________________.
1. blackbody 2. bluer 3. shorter 4 frequency 5. fourth 6. wavelengths, frequencies 7. thermal 8. plasmas 9. neutral hydrogen 10. temperature
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