According to the definition of “science” given in this chapter, astrology is not a science. What does it lack?
A. A community of scholars devoted to its study
B. Agreement that models must be logically consistent
C. Use of reproducible experiments to test models
D. A grand theory embracing the discipline
C. Use of reproducible experiments to test models
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What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s
A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33
What will be an ideal response?
Apart from its distance from its parent star, what is the next most important factor that determines a planet's habitability?
A) whether it has a large moon B) the size of the planet C) the chemical composition of its atmosphere D) the chemical composition of its surface
Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. a helium flash.