Which of the following types of galaxies are most commonly found in large clusters?
A) spirals
B) ellipticals
C) lenticulars
D) irregulars
B
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Kepler's second law of planetary motion states that:
A) a planet moves at its greatest speed when it is closest to the Sun. B) the more massive a planet is, the more its speed will be. C) all the planets move around Earth in elliptical orbits. D) the mass of a planet determines how far the planet is from the Sun.
Two objects collide and stick together. Which of the following is false?
A. momentum is conserved B. kinetic energy is lost C. kinetic energy is conserved D. momentum is lost
You can build an interferometer yourself if you use the following components:
A) a light source, a detector screen, a flat mirror, and a glass plate. B) a light source, a detector screen, two partially silvered mirrors, and a glass plate. C) a light source, a detector screen, two partially silvered mirrors, a flat mirror, and a glass plate. D) a light source, a detector screen, a partially silvered mirror, a flat mirror, and a glass plate. E) a light source, a detector screen, a partially silvered mirror, two flat mirrors, and a glass plate.
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)
A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz