Current understanding holds that a galaxy's type (spiral, elliptical, or irregular)
A) is always determined by the angular momentum of the protogalactic cloud that formed it.
B) may either be the result of conditions in the protogalactic cloud that formed it or the result of later interactions with other galaxies.
C) is determined by whether the galaxy is located in a cluster where collisions are likely or outside a cluster where collisions are less likely.
D) may either be a result of the mass of the protogalactic cloud that formed it or the result of the heavy element abundance in that cloud.
B
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An electron is bound in an infinite well (a box) of width 0.10 nm. If the electron is initially in the n = 8 state and falls to the n = 7 state, find the wavelength of the emitted photon
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) What will be an ideal response?
All Lyman emission lines are transitions from the excited state to ________ state
Fill in the blank(s) with correct word
According to the theory of seafloor spreading, molten rock is rising up along
A) the mid-ocean ridges. B) trenches that border continental margins. C) islands surrounding the Pacific volcanic rim. D) areas of sinking seafloor.
Why do compasses point north?
a. Because the Coriolis force tends to force to point to the North Pole. b. Because Earth is a magnet with a magnetic north pole near the geographic North Pole. c. Because Earth is a magnet with a magnetic south pole near the geographic North Pole. d. Because the Earth is unmagnetized but its atmosphere is magnetic, especially near the North Pole. e. Because the Coriolis force deflects magnetic field lines to the right.