Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 30.0° to that of polarizer 1 . Polarizer 3 is placed after polarizer 2 . Polarizer 3 has its plane of polarization at 30.0° to the plane of polarization of polarizer 2 and at 60.0° to that of polarizer 1 . What fraction of the intensity of the original light gets though
the last polarizer?
a. 0.707
c. 0.281
b. 0.125
d. 0.553
C
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The ____________________ shows that sunspots are associated with magnetic activity
Fill in the blank(s) with correct word
If one uses the classical expression for kinetic energy (1/2 m v2 ) for a particle traveling at half the speed of light, the result will be deficient by how many percent?
A) 13% B) 7% C) 1% D) 24% E) 27%
A photon cannot create an electron pair unless its frequency is
A) less than 1.24 × 1020 Hz. B) less than 2.47 × 1020 Hz. C) greater than 1.24 × 1020 Hz. D) greater than 2.47 × 1020 Hz. E) infinite.
When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of that radio station, which illustrates
A) forced vibrations. B) resonance. C) beats. D) reverberation. E) wave interference.