In what region of the Sun are most of X-rays generated?
A) the inner core
B) the photosphere
C) the chronosphere
D) the corona
Answer: D
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A negatively-charged particle is slowly moving as it enters a region that has a constant magnetic field. If the velocity of the particle is initially parallel to the magnetic field, what will be the subsequent motion of the particle?
a) It will follow a helical path around the magnetic field lines. b) It will follow a circular path in the plane perpendicular to the magnetic field lines. c) It will follow a straight line path in the same direction as it was initially traveling. d) It will follow a circular path in a plane parallel to the magnetic field lines. e) It is impossible to predict the path the particle will follow.
An electron microscope makes use of
A) short wavelengths of light. B) the wave nature of electrons. C) electron attraction and repulsion. D) electron current. E) the inertia of electrons.
The following data refer to a car traveling west: t (s) 0 1 2 3 4 -------------------------- v (m/s) 30 25 20 15 10 Find the magnitude and direction of the acceleration
A capacitor consists of a set of two parallel plates of area A separated by a distance d. The capacitor plates carry charges +Q and -Q. If the separation between the plates is doubled, the electrical energy stored in the capacitor will
A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.