A certain ideal gas has a molar specific heat at constant pressure of 7R/2. What is its molar specific heat at constant volume?
A) 5R/2
B) 3R/2
C) 8R
D) 9R/2
E) 6R
A
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Which of the following statements about the sunspot cycle is not true?
A) The number of sunspots peaks approximately every 11 years. B) With each subsequent peak in the number of sunspots, the magnetic polarity of the Sun is the reverse of the previous peak. C) The rate of nuclear fusion in the Sun peaks about every 11 years. D) The cycle is truly a cycle of magnetic activity, and variations in the number of sunspots are only one manifestation of the cycle. E) The number of solar flares peaks about every 11 years.
How do we determine the conditions that existed in the early universe?
A) We work backward from current conditions to calculate what temperatures and densities must have been when the observable universe was much smaller in size. B) We look all the way to the cosmological horizon, where we can see the actual conditions that prevailed all the way back to the first instant of the Big Bang. C) The conditions in the very early universe must have been much like those found in stars today, so we learn about them by studying stars. D) We can only guess at the conditions, because we have no way to calculate or observe what they were.
Higher mass protostars enter the main sequence:
A) faster and at a higher luminosity and temperature. B) faster and at a lower luminosity and temperature. C) slower and at a higher luminosity and temperature. D) slower and at a lower luminosity and temperature. E) at the same rate, but at a higher luminosity and temperature.
Earth's magnetic axis is the same as its rotation axis.
Answer the following statement true (T) or false (F)