Which telescope imaged the center of the Milky Way Galaxy at a wavelength of 8 microns to reveal the distribution of the dusty interstellar medium?
a. Spitzer Space Telescope
b. infrared telescope
c. European Southern Observatory
d. X-ray telescope
e. radio telescope
a
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A _____________ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons
a. black hole b. neutron star c. white dwarf d. supernova remnant e. red dwarf
When two pieces of fissionable material are assembled, the average distance that a neutron travels before escaping will
A) decrease. B) increase. C) be the same.
What is the main energy transformation (input and useful output) for a person speeding up while riding a bicycle?
A) kinetic E ? chemical E B) thermal E ? kinetic E C) chemical E ? elastic E D) elastic E ? kinetic E E) chemical E ? kinetic E
A light ray whose frequency is 6.00 × 10^14 Hz in vacuum is incident on water (n = 1.33). The wavelength of the light after it enters the water is (in nm)
a. 798 b. 500 c. 665 d. 376 e. 266