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

Physics & Space Science

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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°

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

It was the Chinese who provided critical ancient data on supernovae and comets

Indicate whether the statement is true or false

Physics & Space Science