Which of the following light rays is drawn incorrectly?
A. a
B. b
C. c
D. d
E. e
D. d
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Which of the following wavelengths could NOT be present as a harmonic on a 2-m-long string?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
A primary force that produces air motion is
a. gravity. b. the Coriolis force. c. friction. d. the electromagnetic force.
Which statement about Pluto's discovery is FALSE?
A) It was predicted by Percival Lowell, based on perturbation theory. B) It was discovered by Clyde Tombaugh close to Lowell's predicted position. C) It was found in 1930, the first planet found by an American. D) It was the massive jovian Lowell described as "Planet X" in his calculations. E) Cold and dark, it was named for the god of the underworld.
An electron is in an infinite square well (a box) that is 8.9 nm wide. What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV