You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J. What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.15 nm B) 0.18 nm C) 0.22 nm D) 0.11 nm
D
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A mass is suspended vertically from a spring so it is at rest at the equilibrium position. The mass is pulled straight down to an extension x and released so that it oscillates about the equilibrium position. The acceleration of the mass is zero when the mass is
A. at its maximum upward travel. B. at the equilibrium point. C. at its maximum lower travel. D. somewhere between the equilibrium point and maximum extension.
Kepler's Third Law of planetary motion states that
A) the further a planet is from the Sun, the faster it moves in its orbit B) an imaginary line joining the Sun and planet sweeps out equal areas in equal times C) the further a planet is from the Sun, the slower it moves in its orbit D) the orbits of planets are ellipses
Astronomers infer that the universe is expanding because distant galaxies all appear to ________
A) be made mostly of dark matter B) be moving away from us, with more distant ones moving faster C) rotate rapidly D) be growing in size
Which of the following locations would receive the most incoming solar radiation at noon during the spring equinox?
What will be an ideal response?