If a binary is detected by periodic shifts in its spectral lines, it is a(n) ________ binary
Fill in the blank(s) with correct word
spectroscopic
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An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
Heisenberg's Uncertainty Principle states that
A) all measurements are to some extent inaccurate, no matter how good the instrument used. B) we cannot in principle know simultaneously the position and momentum of a particle with absolute certainty. C) we can never be sure whether a particle is a wave or a particle. D) at times an electron appears to be a particle and at other times it appears to be a photon. E) the charge on the electron can never be known with absolute accuracy.
A styrofoam ball of mass 0.120 g is placed in an electric field of 6000 N/C pointing downward. What charge must be placed on the ball for it to be suspended?
A) -16.0 nC B) -18.0 nC C) -57.2 nC D) -125 nC E) -196 nC
Jack and Mary view the same microorganism through the same compound microscope. Mary's near point distance, NM, is twice as large as Jack's near point distance, NJ
If Mary sees the microorganism with magnification MM, with what magnification does Jack see it? A) 8 MM B) MM/4 C) MM/2 D) 4 MM E) 2 MM