What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 66.5 km/s B) 51.0 km/s C) 21.7 km/s D) 113 km/s E) 44.2 km/s
B
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Standing Waves on a String: A 25-g string is stretched with a tension of 43 N between two fixed points 12 m apart. What is the frequency of the second harmonic?
A. 6.0 Hz B. 12 Hz C. 18 Hz D. 24 Hz E. 36 Hz
What is the eventual fate of a brown dwarf?
A) It remains the same forever. B) It gradually cools down and becomes ever dimmer. C) It gradually contracts and heats up until nuclear fusion ignites in its interior and it becomes a faint star. D) It becomes ever denser and hotter until it becomes a white dwarf. E) Gravity ultimately "wins" and it becomes a small black hole.
In the United States, the value of ? for commercially generated power is ________ in SI units
a. 50 b. 60 c. 120 d. 377
Which of the following telescopes must be used above Earth's atmosphere?
a. an optical telescope b. the VLBI telescope c. an x-ray telescope d. a radio telescope e. none of the above