The thermal radiation of a star depends upon the distance to the star, and we can't calculate distances to stars farther than about 100 parsecs. C. Thermal radiation is independent of the distance to a star, but not its temperature. D. The Earth's atmosphere gets in the way for very hot and very cool stars. E. None of the above is correct. Both A and B E. Both B and C .
All radiation is emitted at one frequency, characteristic of the temperature.
The intensity of radiation peaks at one frequency and falls off above and below that frequency. The radiation is constant at all frequencies. D. Most of the radiation is trapped by our Earth's atmosphere. E. None of the above is correct. Answer B Some of the properties of an electromagnetic wave are listed below.