Which of the following studies is best suited to a time monitoring experiment?
A) studying how different stars differ in their chemical compositions
B) studying whether a particular star's brightness is steady or variable
C) determining the age of the solar system
D) measuring the rotation rate of a distant star
E) estimating the time since the Big Bang
B
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Which of the following is a negatively charged polyatomic ion?
a. Ammonium ion b. Oxide ion c. Sodium ion d. Nitrate ion
A metal has a Fermi level of 5.50 eV. At 1200 K, what energy will have a 90% occupancy probability?
A) 5.79 eV B) 5.73 eV C) 5.56 eV D) 5.44 eV E) 5.27 eV
An elevator suspended by a vertical cable is moving downward but slowing down. The force that the cable exerts on the elevator must be
A) greater than the force that Earth exerts on the elevator. B) less than the force that Earth exerts on the elevator. C) equal to the force that Earth exerts on the elevator.
The density of a _________ is greater than the density of a _________
a. white dwarf; neutron star b. neutron star; black hole c. pulsar; neutron star d. pulsar; white dwarf e. white dwarf; black hole