The evolution of a medium-mass star like the Sun, when off of the main sequence, is ____
a. strongly affected by mass absorption from the interstellar medium
b. strongly affected by mass absorption from the corona
c. not affected by mass loss due to increased solar winds
d. strongly affected by mass loss due to increased solar winds
e. strongly affected by mass loss due to hydrogen fusion
d
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Active galaxies were first discovered by observations in the _______________ wavelength band
Fill in the blank(s) with correct word
An observer on Earth's equator would find _______
a. the celestial equator passing at 45 degrees above the northern horizon. b. the celestial equator passing at 45 degrees above the southern horizon. c. that the celestial equator coincides with the horizon. d. the celestial equator passing directly overhead. e. None of the other choices are true.
The sound from a single source can reach point O by two different paths. One path is 20.0 m long and the second path is 21.0 m long. The sound destructively interferes at point O
What is the minimum frequency of the source if the speed of sound is 340 m/s? A) 340 Hz B) 6800 Hz C) 520 Hz D) 680 Hz E) 170 Hz
A plot of the temperature versus the energy per kg added to a piece of ice as it goes from below freezing at –10°C to becoming steam at 110°C consists of straight lines, some horizontal and some with an upward slope. What do the upward slopes represent?
a. specific heats c. latent heats b. reciprocals of specific heats d. reciprocals of latent heats