In vacuum, the components of an EM wave are 
and 
0. What 
?
a. 
b. 
c. 
d. 
e. More information is needed.
a.
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How do scientists estimate the age of the universe?
A) They look up the answer in a book or they Google it. B) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age of the meteorites, which are the oldest solids in the solar system. C) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance (away from us). D) They make a guess: no one really knows how old the universe is. E) They measure how fast the Sun is losing energy, and how much energy it has left to lose.
From Earth, the Sun and Moon have about the same angular diameter
Indicate whether the statement is true or false
The frequency of the second hand on a clock is
A) 1 hertz. B) 1/60 hertz. C) 60 hertz.
Suppose you are sitting at the origin of an inertial reference frame. You see (that is, you receive the light from) an event E occurring near a clock at x = -30 ns at a time t = 80 ns. When do you observe that event to occur?
A. tE = 0 B. tE = 30 ns C. tE = 50 ns D. tE = 80 ns, of course E. tE = 110 ns F. Some other time (specify)