Answer the following statement(s) true (T) or false (F)
Suppose we have a box containing an electron with the lowest possible energy E1. Imagine that we slowly squeeze the box, making its length L smaller. What will happen to the electron’s energy? The system described in problem Q10T.5 will resist being compressed in the manner described by exerting an opposing force on whatever is compressing it.
TRUE
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Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. B) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. C) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.
The direction of the force on an electric charge in a magnetic field is
a. in the direction of the magnetic field. b. in the direction of motion of the charge. c. perpendicular to the magnetic field. d. perpendicular to the direction of motion of the charge. e. none of the above.
Of the following states, 5s, 3p, 4f, 5p, 4g, 3d, and 2p, the one which is NOT allowed is
a. 3p b. 4f c. 3d d. 4g e. 2p
A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s?1) of the system of ladder and woman is
A. 1.01. B. 3.07. C. 4.03. D. 8.05. E. 16.2.