If the Sun was replaced by a black hole of equal mass, Earth would _____
a. fall into the black hole on a virtually straight path
b. spiral in to the black hole over several months
c. spiral in to the black hole over the course of several decades
d. continue in its normal orbit
e. spiral away from the black hole, pushed by gravitational waves
d
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Two emerging beams of light produced by a birefringent crystal
A) are at different frequencies. B) will produce an interference pattern when recombined. C) are polarized in the same direction. D) are polarized in mutually perpendicular directions. E) are at 90° with respect to one another.
The energy released when an unstable electron state decays has an uncertainty of about 0.50 eV
What is the uncertainty in the life-time of the level? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 1.3 × 10-11 s B) 1.3 × 10-15 s C) 8.3 × 10-11 s D) 8.3 × 10-15 s
When water at 4°C is heated, it expands. When water at 4°C is cooled, it
1) contracts, 2) expands, 3) neither contracts nor expands, 4) not enough information given, which follows from the fact that 5) cooling decreases the kinetic energy of H2O molecules. 6) water has its greatest density at 4°C. 7) we do not know how the water is cooled.
Determine the potential difference Va?Vb shown in the circuit below.
A. ?5.0 V B. +5.0 V C. ?10 V D. +10 V E. 0 V