Radio dishes are large in order to
A) attract funding from NASA and the NSF.
B) give greater magnification.
C) increase their angular resolution and collect the very weak radio photons.
D) increase the range of waves they can collect.
E) detect shorter waves than optical telescopes for superior resolution.
C
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The chemical properties of an element are determined by the
A. number of nucleons in the nucleus B. number of neutrons in the nucleus C. number of electrons in the atom
Index of Refraction: Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0. What is the frequency of the light in this liquid? (c = 3.0 × 108 m/s)
A. 12 × 1014 Hz B. 6.0 × 1014 Hz C. 3.0 × 1014 Hz D. 1.5 × 1014 Hz E. 2.0 × 1014 Hz
Given the rate at which human activity is increasing atmospheric carbon dioxide levels, why can't we expect the natural carbon dioxide cycle to prevent global warming?
A) It operates too slowly. B) It only affects the rate at which carbon dioxide circulates within the atmosphere, not the total amount of carbon dioxide in the atmosphere. C) The natural carbon dioxide cycle no longer operates. D) The carbon dioxide cycle can only affect natural carbon dioxide, not the carbon dioxide released through human activity.
Which of the following compounds would not precipitate from an aqueous solution during a double-replacement reaction?
a. Cu(NO3)2 b. CuCO3 c. AgCl d. AlPO4