Winds are generated on Earth primarily because of
a. strong updrafts from the equator and air sinking near the poles.
b. uneven heating of the surface and rotation of the planet.
c. water condensation onto mountains.
d. hot air rising and cool air sinking.
b. uneven heating of the surface and rotation of the planet.
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Which event marks the beginning of a supernova?
A) the expansion of a low-mass star into a red giant B) the beginning of neon burning in an extremely massive star C) the onset of helium burning after a helium flash in a star with mass comparable to that of the Sun D) the sudden collapse of an iron core into a compact ball of neutrons E) the sudden outpouring of X-rays from a newly formed accretion disk
Where are the X-rays produced that are emitted by quasars and other active galactic nuclei?
A) in the hot gas in an accretion disk around a central black hole B) in dust grains in molecular clouds that encircle the active galactic nucleus C) in an ionization nebulae of interstellar gas surrounding the accretion disk D) in fast-moving jets of electrons that are ejected from the active galactic nucleus E) all of the above
An electron has a wavelength of 0.123 nm. What is its energy in eV?
A) 80. keV B) 20. keV C) 40. keV D) 10. keV E) 60. keV
The rotation curve method works:
A) only for galaxies near enough to be well resolved. B) only for distant spiral galaxies. C) only for elliptical galaxies. D) for all galaxies, irrespective of their distance from Earth.