An electron and a baseball move at the same speed. Which has the longer wavelength?
A) the electron
B) the baseball
C) both the same
D) none of the above
Answer: A
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The absolute temperature of an ideal gas is directly proportional to which of the following?
A. speed B. momentum C. kinetic energy D. mass
Hydrogen and oxygen molecules in a sample of gas have the same temperature. This means the hydrogen molecules, on average, have the same
A) speed and the same kinetic energy. B) speed, but more kinetic energy. C) speed, but less kinetic energy. D) kinetic energy, but more speed. E) kinetic energy, but less speed.
The hydrogen lines in spectral type A stars
a. are most narrow for supergiants. b. are most narrow for main sequence stars. c. can not be used to estimate the luminosity of the star. d. are very weak and difficult to see. e. are useful in determining the apparent magnitude of the star.
Protostars are observable by radio telescopes but hard to detect in visible light because they have ________ and are ________.
A. low surface temperature; very distant B. small size; very distant C. low surface temperature; surrounded by dust D. small size; very hot