The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that
A) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way.
B) luminous matter emits white light, much like the light reflected from icebergs.
C) black holes are much more interesting than ordinary stars that give off light.
D) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter.
A) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way.
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Radioactive Decay: The decay constant of a radioactive nuclide is 3.1 × 10-3 s-1. At a given instant, the activity of a specimen of the nuclide is 70 kBq. How much later has the activity declined to 10 kBq?
A. 630 s B. 690 s C. 750 s D. 820 s E. 880 s
Find the wavelength of the photon emitted during the transition from the second EXCITED state to the ground state in a harmonic oscillator with a classical frequency of 3.72 × 1013 Hz
(c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 4.03 ?m B) 2.26 ?m C) 2.98 ?m D) 5.24 ?m
Three point charges are placed on the x-axis. A charge of +2.0 ?C is placed at the origin, -2.0 ?C to the right at x = 50 cm, and +4.0 ?C at the 100 cm mark
What are the magnitude and direction of the electrostatic force which acts on the charge at the origin?
As a space shuttle is launched into orbit, the direction of its acceleration
a. always points upward. b. always points downward. c. varies between pointing upward and pointing downward. d. stays constant.