Which of the following best describes what we mean by the term universe?
A) the sum total of all matter and energy
B) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth
C) all the galaxies in all the superclusters
D) our Milky Way Galaxy
A) the sum total of all matter and energy
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The diagram below shows three approximate locations of the sun along the western horizon. Which number indicates the location of the sun at sunset on December 21st for an observer at latitude 48° N?
a. 1
b. 2
c. 3
d.The sun will set in the east.
e.The sun will not set on December 21st at this latitude.
Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate gas does not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. None of the other choices are correct.
Suppose that at time t = 0 an electron in a magnetic field in the +z direction has state 
. Let 
The expectation value 
as a function of time in this case is which of the below?
A. 
B. 
C. 0
D. 
E. 
F. Something else (specify)
The ________ spitting of the spectral lines is due to a strong magnetic field present
Fill in the blank(s) with correct word