A 3 solar mass main sequence star is at the same distance as a 0.4 solar mass main sequence star. Which star appears brighter?
A. depends on the phase of the Moon
B. the 0.4 solar mass main sequence star
C. stars are approximately the same brightness
D. the 3 solar mass main sequence star
E. cannot tell with the information given
Ans: D. the 3 solar mass main sequence star
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Early in the 20th century, our galaxy was estimated to be:
A) about 100,000 ly in diameter. B) about 35,000 ly (10 kpc) in diameter. C) about 10 million ly in diameter. D) not much larger than our solar system. E) about 2.5 million ly in diameter.
Which of the following would serve as the best time standard?
1.the rotation of Earth upon its axis 2.the vibration of a CS-133 atom 3.a grandfather clock 4.the buzzing of a mosquito
Answer the following statement(s) true (T) or false (F)
1. In a specific non-dispersive medium, a sinusoidal wave’s angular frequency is proportional to its wavenumber 2. In a specific non-dispersive medium, a sinusoidal wave’s period is proportional to its wavelength
During the period of one day, the number of high tides at a given point is about
a. one b. two c. three d. four e. none of the above