In order for organic molecules to have formed on the early Earth, what do we know could not have been present in the atmosphere in significant quantities?
A) oxygen (O2)
B) nitrogen (N2)
C) carbon dioxide (CO2)
D) argon (Ar)
A
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How is the GAIA mission relevant to the search for extrasolar planets?
A) It can detect planets through the astrometric method. B) It can obtain moderate-resolution images of extrasolar planets. C) It can detect planets through the Doppler method. D) It can detect planets through the transit method.
What is the mass of the supermassive black hole in the center of the Andromeda galaxy?
A. 10 times the mass of our Sun. B. 5000 billion times the mass of our Sun C. 400 billion times the mass of our Sun D. 30 million times the mass of our Sun E. 20 thousand times the mass of our Sun.
In one experiment, a photon entered one detector and that detector then indicated the slit through which a second photon passed in a double-slit experiment that was some distance away from the first detector. This experiment shows that
A) macroscopic detectors always exert actual forces on microscopic particles, even at a distance. B) it is possible for a detector to obtain complete information about a particle's simultaneous position and velocity, without causing a sudden change in the EM field. C) whenever a detector exerts an actual force on a particle, it causes the particles EM field to suddenly change. D) microscopic events are subject to Heisenberg's uncertainty principle whenever detectors are involved. E) macroscopic detectors can have non-local effects even on objects that they do not directly interact with.
Because HF, hydrogen fluoride, is a covalent gaseous molecule at room temperature, we might reasonably expect that at room temperature HCl, hydrogen chloride, is
a. a covalent gaseous molecule. b. a covalent solid. c. a metallic gas. d. a metallic solid. e. an ionic solid.