In its lowest quantum state, the energy of a diatomic harmonic oscillator is
A)
(1/4)hf.
B)
(1/2)hf.
C)
hf.
D)
2hf.
E)
(3/2)hf.
B
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Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His x-ray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 2.1 × 10^2 m, how long does Superguy have to save Lois, and what must be his average speed?
a. 4.5 s, 200 m/s c. 7.0 s, 140 m/s b. 6.5 s, 150 m/s d. 9.0 s, 110 m/s
The cluster method (motions of galaxies in a cluster of galaxies) can be used to determine the cluster's mass
a. luminosity. b. distance. c. mass. d. diameter. e. age.
When a body moves in a straight line with increasing speed, the net force on it must be increasing
a. True b. False Indicate whether the statement is true or false
When white light passes through a cool cloud of gas, we see
A) visible light. B) infrared light. C) thermal radiation. D) an absorption line spectrum. E) an emission line spectrum.