Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems.
b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies.
c. generally show redshifts greater than 6.
d. are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies.
e. are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.
d
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Compared to life today the rate of diversification in early organism was probably
A) exactly the same as it is today B) much slower than it is today C) much faster than it is today D) just slightly slower than it is today
The energies of two photons you might detect emitted by hydrogen atoms are 10.2 and 2.1 eV. Which photon has the longest wavelength?
A) the 10 eV photon B) the 2.1 eV photon C) They both have the same wavelength.
An elephant can hear sound with a frequency of 15 Hz. What is the wavelength of this wave if the speed of sound in air is 343 m/s?
What will be an ideal response?
Stars with masses between 0.4-Mo and 4-Mo
a. undergo thermonuclear fusion of hydrogen and helium, but never get hot enough to ignite carbon. b. undergo thermonuclear fusion of hydrogen, but never get hot enough to ignite helium. c. produce type I supernovae after they exhaust their nuclear fuels. d. produce type II supernovae after they exhaust their nuclear fuels. e. undergo carbon detonation.