A metal surface is illuminated with blue light and electrons are ejected at a given rate each with a certain amount of energy. If the intensity of the blue light is increased, electrons are ejected
A)
at the same rate, but with more energy per electron.
B)
at the same rate, but with less energy per electron.
C)
at an increased rate with no change in energy per electron.
D)
at a reduced rate with no change in energy per electron.
C
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A spinning neutron star has been observed at the center of a
A) planetary nebula. B) supernova remnant. C) red supergiant. D) protostar.
The energy level diagram for hydrogen
The energy of a photon emitted in a transition from the n = 3 state to the n = 2 state is __________.
A 1 000-V battery, a 3 000-? resistor and a 0.50-µF capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, ?, is defined as the time required to charge the capacitor to 63% of its capacity after the switch is closed. What is the value of ? for this circuit?
a.
6.0 × 109 s
b.
1.7 × 10?10 s
c.
1.7 × 10?7 s
d.
1.5 × 10?3 s
Fiber optics has to do with:
a. the color of fabrics. b. light having fiber characteristics as well as wave and particle characteristics. c. string theory. d. none of the above.