Which of the following are characteristics of laser light? (There may be more than one correct choice.)
A) It is coherent.
B) It contains a full spectrum of wavelengths.
C) It is produced by an inverted population of atoms.
A, C
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Specific Heat: If 150 kcal of heat raises the temperature of 2.0 kg of a material by 400 F°, what is the specific heat capacity of the material?
A. 1.35 kcal/kg ? C° B. 0.75 kcal/kg ? C° C. 0.34 kcal/kg ? C° D. 0.19 kcal/kg ? C°
When astronomers use Hubble's law to measure the distance to a galaxy they have to measure the ________ of the galaxy.
A. mass B. recessional speed C. rotational speed D. luminosity
It was the Chinese who provided critical ancient data on supernovae and comets
Indicate whether the statement is true or false
A spar buoy is a cylindrical object that floats with its axis in the vertical direction
When it is disturbed a distance h from its equilibrium position, the magnitude of the restoring force is equal to ?ghS, where ? is the density of the water and S is the cross-sectional area of the cylinder. A certain spar buoy has a mass of 150 kg, a cross-sectional area of 2.50 m2, and is floating in seawater, ? = 1025 kg/m3. What is the frequency of ocean waves which will cause it to resonate? A) 12.9 Hz B) 2.06 Hz C) 7.19 Hz D) 17.1 Hz E) 2.72 Hz