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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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
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