Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity?
a. 3 polarizing filters, each rotate beam by 30°
b. 2 polarizing filters, both rotate beam by 45°.
c. 1 polarizing filter, rotating beam by 90°.
d. None of the above, polarized light can't be rotated.
a
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Charm, beauty, and truth are three quantum numbers for quarks
a. True b. False Indicate whether the statement is true or false
A wave with a frequency of 5 Hz will have a period of ______________ s
Fill in the blank(s) with correct word
The rigid body shown rotates about an axis through its center of mass and perpendicular to the paper. If M = 2.0 kg and L = 80 cm, what is the kinetic energy of this object when its angular speed about this axis is equal to 5.0 rad/s? Neglect the mass of the connecting rod and treat the masses as particles
a.
18 J
b.
15 J
c.
12 J
d.
23 J
e.
26 J
Not only does the central engine of active galaxies and quasars require a black hole, but also ________ to provide the radiate energy
A) globular clusters for food B) a very strong magnetic field from neutron stars C) a source of high-energy electrons for synchrotron radiation D) an accretion disk of infalling matter E) a high rate of rotation for the black hole