In a plot of probability of finding the electron in the hydrogen ground state versus the distance from the nucleus, the maximum occurs
a. at a0, the first Bohr radius.
b. at slightly less than a0.
c. at slightly more than a0.
d. at 2 a0.
a
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A loop lying in the xy plane conducts a conventional current in the direction shown. What is the direction of the magnetic field at each of points a through f?
A. +x direction
B. -x direction
C. +y direction
D. -y direction
E. +z direction
F. -z direction
T. The field is zero.
As a car drives with its tires rolling freely without any slippage, the type of friction acting between the tires and the road is
A) static friction. B) kinetic friction. C) a combination of static and kinetic friction. D) neither static nor kinetic friction, but some other type of friction. E) It is impossible to tell what type of friction acts in this situation.
Which statement about the Local Group is false?
A) Most of its members are dwarf elliptical and irregular galaxies. B) It contains about 55 member galaxies. C) Its notable spirals include the Milky Way, M31, and M33. D) It contains the large radio galaxy Centaurus A. E) It is about three million light-years across.
A particle has a total energy that is less than that of a potential barrier. When the particle penetrates the barrier, its wave function is
a. a positive constant. b. exponentially increasing. c. oscillatory. d. exponentially decreasing. e. none of the above.