The EM wave that has the smallest wavelength in this list is
a. ultraviolet
b. infrared
c. x rays
d. microwave
e. gamma rays
E
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The Local Group
A. contains about 30 member galaxies. B. has the Milky Way as its center. C. is a supercluster. D. is the globular cluster to which the Milky Way belongs. E. None of these choices is correct.
Some charged particles in a bubble chamber are seen to move in spirals due to
A) decreasing magnetic field. B) decreasing electric charge. C) perspective and parallax. D) energy dissipation.
When a star has exhausted all of its hydrogen, it is said to have reached the zero-age main sequence (ZAMS)
Indicate whether the statement is true or false
On page 526 of your textbook, you learned that one gram of radium produces over a million times the radiation as does one gram of uranium. This means that a much larger fraction of radium atoms are undergoing radioactive decay each second than for uranium. How does the half-life of radium compare to the half-life of uranium?
a. The half-life of radium is much smaller than the half-life of uranium. b. The half-life of radium is the same as the half-life of uranium. c. The half-life of radium is much larger than the half-life of uranium. d. The information is insufficient to answer the question. e. The half-life of the radium is shorter at first, but gets longer as the radium sample is depleted.