Giant and supergiant stars are rare because that stage of stellar evolution is short
a. True
b. False
Indicate whether the statement is true or false
True
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In experiments involving the setup shown in figure Q4.1b, the value that the voltmeter displays increases for a short period of time after light starts shining on the cathode, but then quickly settles down to a fixed value. Why? 
A. The cathode eventually stops emitting electrons. B. The kinetic energy of ejected electrons starts out small but quickly reaches a maximum value. C. The charge difference between the cathode and anode is initially small but with time becomes so large that no electron from the cathode can make it to the anode. D. The cathode eventually runs out of electrons to emit. E. Some other explanation (describe).
The absolute magnitude scale is defined so that a difference of five magnitudes is a luminosity difference of ________
Fill in the blank(s) with correct word
If there is a net torque on a wheel, then
A. the wheel cannot be spinning. B. the angular momentum of the wheel cannot change direction. C. there must be a net force on the wheel. D. the wheel must have a nonzero angular acceleration.
In the GUT, electromagnetism and the strong nuclear force are the last to appear
Indicate whether the statement is true or false