If a point charge is located at the center of a cylinder and the electric flux leaving one end of the cylinder is 20% of the total flux leaving the cylinder, what portion of the flux leaves the curved surface of the cylinder?
A)
20%
B)
100%
C)
80%
D)
40%
E)
60%
E
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Resolution: Given perfect lenses, what is the main reason that a telescope with a large-diameter objective lens can produce a sharper image than one with a small-diameter lens?
A. A larger lens can gather more light than a smaller lens. B. A larger lens can focus more accurately than a smaller lens. C. There is less diffraction with a larger lens than with a smaller lens. D. A larger lens can focus more wavelengths of light than a smaller lens. E. A larger lens has a longer focal length than a smaller lens.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If 
= [15, 80°] and 
, what is the magnitude of 
?
A. 15
B. 35
C. 32
D. 5.0
E. 23
A proton and an electron are both accelerated to the same final kinetic energy. If ?p is the de Broglie wavelength of the proton and ?e is the de Broglie wavelength of the electron, then
A) ?p = ?e. B) ?p > ?e. C) ?p < ?e.
Which types of galaxies lack an ordered structure of stellar orbits?
a. elliptical galaxies only b. spiral galaxies only c. irregular galaxies only d. elliptical and irregular galaxies e. spiral and irregular galaxies