Which hypothetical universe has a older age, all other things being equal?
A. The one with moe dar matter
B. dar matter doesn't affect the inferred age of the universe
C. The one with less dark matter
Answer: C. The one with less dark matter
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The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 4, when its life track moves straight down to join the main sequence?
A) Its surface temperature and luminosity increase. B) Its surface temperature increases, and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases, and its luminosity increases. E) Its surface temperature and luminosity remain the same.
New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors b. using computer image processing to enhance images c. building mirrors in hexagonal segments d. continually adjusting the mirror's shape during observations
A ____ is believed to occur when energy, stored in a twist in the solar magnetic field above a sunspot, is suddenly released
a. solar flare b. supergranule c. spicule d. coronal hole e. none of the above
Consider an RLC circuit. The impedance of the circuit increases if R increases
A) always true B) true only if XL is less than or equal to XC C) true only if XL is greater than or equal to XC D) never true