A perfectly opaque object that absorbs all radiation and reemits the absorbed energy as thermal radiation is
A) a hot, dense cloud of gas.
B) a cold, dense cloud of gas.
C) an infrared radiation emitter.
D) a thermal emitter.
E) transparent.
D
You might also like to view...
Which of the following radiations has the greatest frequency?
a. Infrared b. Visible c. Ultraviolet d. X-rays
Find the orbital speed of an ice cube in the rings of Saturn. The mass of Saturn is 5.68 x 1026 kg, and use an orbital radius of 1.00 x 105 km. (G = 6.67 × 10-11 N ? m2/kg2 )
A) 19.5 km/s B) 27.5 km/s C) 13.8 km/s D) 9.40 km/s
What makes a star shine?
A. nuclear fusion of light elements B. radioactive decay of elements in its core C. reflected light from the galaxy D. nuclear fission of heavy elements E. None of these choices is correct.
Which type of main-sequence star(s) is a good candidate for searching Earth-like planets with life?
a. O and B b. G and K c. A and F d. white dwarfs e. binary stars