In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's
A)
frequency must be greater than a certain minimum value.
B)
speed must be greater than a certain minimum value.
C)
wavelength must be greater than a certain minimum value.
D)
momentum must be zero.
A
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Simple Pendulum: A simple pendulum has a period T on Earth. If it were used on Planet X, where the acceleration due to gravity is 3 times what it is on Earth, what would its period be?
A. 3T
B. 
T
C. T
D. T/
E. T/3
A magnetic dipole has two stable orientations in a magnetic field. At what two angles relative to the magnetic field direction are these orientations?
a) 0° and 90° b) 0° and 180° c) 90° and 270° d) 45° and 135° e) 45° and 90°
A goldfish bowl is spherical, 8.0 cm in radius. A goldfish is swimming 3.0 cm from the wall of the bowl. Where does the fish appear to be to an observer outside? The index of refraction of water is 1.33
Neglect the effect of the glass wall of the bowl. A) 3.3 cm inside the bowl B) 3.9 cm inside the bowl C) 2.5 cm inside the bowl D) 3.0 cm inside the bowl E) 1.7 cm inside the bowl
A toy is 14 cm in front of a convex spherical mirror. If the image of the toy is 5.8 cm behind the mirror, what is the focal length of the mirror?
A) -4.1 cm B) +20 cm C) -9.9 cm D) -20 cm E) +9.9 cm