The very first generation of star systems in the universe must have been born from gas that consisted entirely of hydrogen and helium (and no other elements). Which of the following statements is most likely to have been true about these first-generation star systems?
A) They had terrestrial planets but no jovian planets.
B) They did not have any planets or asteroids or comets.
C) They had asteroids and comets but no large planets.
D) They did not have and disks of gas around them as they formed.
B) They did not have any planets or asteroids or comets.
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Which of the following best describes stars in the halo of our Galaxy?
A) young, red, and dim with low abundance of heavy elements B) young, blue, and bright with high abundance of heavy elements C) old, red, and dim with low abundance heavy elements D) old, red, and dim with high abundance of heavy elements E) old, red, and bright with low abundance of heavy elements
Both a radio wave and light wave have identical
A) speeds. B) wavelengths. C) frequencies. D) all of the above E) none of the above
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850
The kinetic energy of a particle is 3 times its rest energy. What is the speed of the particle?
A) 0.950c B) 0.968c C) 0.976c D) 0.984c E) 0.990c