Which of the following best describes a sound level of intensity 10–6 W/m2?
a. extremely loud
c. normal conversation
b. about that of a power mower
d. like a whisper
C
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Conversion of Units: Rover eats 0.50 pound of dry dog food per day. How many 5.0-kg sacks of dog food does his owner need to buy in a year? (1.0 kg weighs 2.2 lb)
A. 17 B. 25 C. 52 D. 80 E. 81
The transition in atomic hydrogen that gives the longest wavelength in the visible spectrum is
A. n = 3 to n = 1. B. n = 2 to n = 1. C. n = 4 to n = 1. D. n = 3 to n = 2. E. n = 4 to n = 2.
The minimum size that makes it possible for a planetary surface to remain habitable over long time periods is a size that allows
A) plate tectonics to be present B) a magnetic field to be present C) an atmosphere to be present D) hot spot volcanism to be present
What is not a main source of evidence for the existence of dark matter?
A) massive blue stars B) rotation curves of disk galaxies C) stellar motions in elliptical galaxies D) velocities and positions of galaxies in clusters of galaxies E) gravitational lensing by clusters of galaxies