Photoelectric Effect: Monochromatic light falls on a metal surface and electrons are ejected. If the intensity of the light is increased, what will happen to the ejection rate and maximum energy of the electrons?
A. greater rate; same maximum energy.
B. same rate; greater maximum energy.
C. greater rate; greater maximum energy.
D. same rate; same maximum energy.
Answer: A
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In size, from largest to smallest, the correct order for the Galilean moons is:
A) Callisto, Ganymede, Europa, Io. B) Ganymede, Callisto, Io, Europa. C) Io, Europa, Callisto, Ganymede. D) Europa, Ganymede, Io, Callisto. E) Ganymede, Callisto, Europa, Io.
An electronic component with a 17-? resistor is rated for use at power levels not exceeding What is the safe current through the component?
A) 0.91 A B) 1.21 A C) 238 A D) 0.22 A
Four point charges, each of charge 2.5 x 10-5, are located on the x- and y-axes, one at each of the locations (0, 2.0 m), (0, -2.0 m), (2.0 m, 0), and (-2.0 m, 0). The potential at the origin is
A) 2.3 × 105 V. B) 4.5 × 105 V. C) 3.5 × 105 V. D) 1.1 × 105 V. E) 0.
Answer the following statement(s) true (T) or false (F)
1. A quanton moving in a system whose V (x) is given by the box potential energy function can never be unbound, no matter what its total energy might be. 2. An electron moving near a proton can never be unbound, no matter what its energy might be.