Which of the following best describes the operation of a photovoltaic (solar) cell?
c.
The incoming photon promotes an electron from the valence band to the conduction band, resulting in the flow of electric current.
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A transverse periodic wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). Another transverse wave is represented by the equation y(x, t) = 1.50 cm sin(1,500 rad/s t - 10.0
x). What is the equation that represents the superposition of the two waves?
A. y(x, t) = 3.0 cm sin(1,500 rad/s t - 10.0
x)
B. y(x, t) = 3.0 cm sin(1,500 rad/s t) cos(10.0x)
C. y(x, t) = +3.0 cm cos(1,500 rad/s t) sin(10.0x)
D. y(x, t) = 3.0 cm sin(1,500 rad/s t + 10.0x)
A ball rolls over the edge of a platform with a horizontal velocity of magnitude v. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20 m. What is the magnitude of v if you can ignore air?
What will be an ideal response?
Neglecting air resistance, after a ball leaves your hand when you toss it upward, the force on it
A) gradually decreases until the ball reaches the top of its path. B) first acts upward and then downward after reaching the top. C) is only the force due to gravity, always directed downward. D) none of the above
Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern?
A) 1.1 m B) 1.9 m C) 0.93 m D) 0.47 m E) 0.39 m