What is the symbol traditionally used to represent wavelength?
a. wl c. ?
b. y d. ?
D
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If H equals 70 km/sec/Mpc, then a galaxy with a radial velocity of 2100 km/sec has a distance of approximately
a. 2170 Mpc b. 2030 Mpc c. 30 Mpc d. 0.03 Mpc e. 147,000 Mpc
Newton's Second Law in 1 Dimension: A 45.0-kg person steps on a scale in an elevator. The scale reads 460 N. What is the magnitude of the acceleration of the elevator?
A. 4.91 m/s2 B. 9.81 m/s2 C. 46.9 m/s2 D. 0.206 m/s2 E. 0.422 m/s2
If an astronaut landed on a planet composed of antimatter, there would be an explosion and the
A) planet would annihilate. B) astronaut would annihilate. C) astronaut and an equal amount of planet antimatter would both annihilate.
According to the selection rules, which of the following transitions is not allowed?
A) n = 3, ? = 2 to n = 2, ? = 1 B) n = 4, ? = 3 to n = 3, ? = 2 C) n = 3, ? = 1 to n = 1, ? = 0 D) n = 2, ? = 1 to n = 1, ? = 0 E) n = 4, ? = 2 to n = 3, ? = 2