The _____ is the interval of the radio spectrum between the 21-cm hydrogen emission line and the 18-cm OH emission line; these are likely wavelengths to use in the search for extraterrestrial life
A) water hole
B) habitable zone
C) Arecibo beacon
D) DNS zone
A
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Consider two parallel wires carrying current in opposite directions. Which one of the following statements to true concerning this situation?
a) The two wires will attract each other, even if no external magnetic field is applied to the wires. b) The two wires will repel each other, even if no external magnetic field is applied to the wires. c) The two wires will attract each other, only if an external magnetic field is applied to the wires. d) The two wires will repel each other, only if an external magnetic field is applied to the wires. e) The wires will be neither attracted nor repelled from each other when no external magnetic field is applied to the wires.
A 30.00 kg box slides up a 12.00 meters long incline at an angle of 30.00 degrees above the horizontal. Friction is negligible. The change in gravitational potential energy is
A. 2110 J. B. 1467 J. C. 1080 J. D. 1764 J. E. 760.0 J.
The air that you breathe doesn't emit visible light indicates that most of the electrons of its atoms are
A) in the ground state. B) excited to metastable states. C) relatively cool. D) electrically neutral. E) relatively far apart.
What are the standard candles used to determine that the universe is accelerating?
A: spiral galaxies B: elliptical galaxies C: Type Ia supernovae D: light bulbs E: Type II supernovae formed from the death of massive stars