What is "Hawking radiation"?
What will be an ideal response?
The uncertainty principle allows for virtual particles to pop in and out of existence on extremely short timescales anywhere in space. The production of such particles near the event horizon of a black hole can result in one of the pair entering the black hole and the other remaining outside. Without its virtual partner, this particle becomes a "real" part of space (its mass is equivalent to the gravitational energy lost by its other half falling to the center of the black hole). By symmetry we expect equal numbers of matter and anti-matter particles to form around the black hole and these will eventually meet and annihilate each other, producing what is termed Hawking radiation. The creation of mass-energy from a quantum fluctuation comes at the expense of the black hole which (very slowly) evaporates.
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One practical application of matter waves is
A) the electron microscope. B) photovoltaic cells. C) lasers. D) television. E) X-rays.
A 6.0-?F air capacitor is connected across a 100-V battery. After the battery fully charges the capacitor, the capacitor is immersed in transformer oil (dielectric constant = 4.5)
How much additional charge flows from the battery, which remained connected during the process? A) 1.2 mC B) 1.5 mC C) 1.7 mC D) 2.1 mC E) 2.5 mC
Temperature decreases with altitude in the
A) troposphere. B) stratosphere. C) thermosphere. D) all of these
The ____ is 18 years and 11 days long
a. sidereal period b. synodic period c. eclipse season d. Saros cycle e. eclipse year