If a star's apparent visual magnitude is equal to its absolute visual magnitude, how far is the star located from Earth?
a. 0 pc b. 1 pc
c. 10 pc d. 100 pc
c
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Thermodynamic Processes: In a given reversible process, the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume. Which one of the following statements about the gas is correct?
A. The gas must absorb heat from its surroundings. B. The gas must release heat to its surroundings. C. The pressure of the gas also stays constant. D. The process is adiabatic. E. It is impossible to predict on the basis of this data.
Which of the following properties of the planets in our solar system is NOT explained by condensation theory?
A) direction of revolution B) rotation rates C) chemical compositions D) orbital shapes
Which of the following particles is (are) considered to be elementary?
a. the neutron b. the meson c. the electron d. All of the above.
Images of objects are formed by lenses because of
a. refraction. b. diffraction. c. internal reflection. d. all of these.