One star is emitting primarily visible light and another star is emitting primarily infrared light. Which star is hotter?
A) the star emitting infrared light
B) the star emitting visible light
C) Both stars are the same temperature.
D) The temperature also depends on the radius of the star, so one can't decide based on the information provided.
B
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Which of the following characterize(s) a wave?
a. Wavelength b. Amplitude c. Period d. All of these
What type of spectrum is emitted by a hot, tenuous gas?
A. emission-line B. continuous C. absorption-line D. None of these choices are correct.
SHM may be written y = A sin( ?t + ? ). What is the value of ?, the phase constant, when:
(a) the initial displacement is zero? (b) the initial displacement is A? (c) the initial velocity is zero?
If the density of the universe is greater than the critical density, this means that:
A) the universe is expanding at a rate equal to the escape speed of the universe. B) the universe is expanding at a rate less than the escape speed of the universe. C) the universe is expanding at a rate greater than the escape speed of the universe. D) the universe is expanding at a rate equal to the speed of light. E) the universe is expanding at a rate greater than the speed of light.