What percentage of stars lie on the main sequence? Why?
What will be an ideal response?
About 90% of all stars are still fusing hydrogen to helium in their cores.
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When you look into a pool of water, the depth looks less than it actually is because of
a. interference b. diffraction c. specular reflection d. refraction e. polarization
A Carnot engine operates between two reservoirs with unknown temperatures. If the Carnot engine operates at 67% efficiency, what is the ratio of the absolute temperatures of the reservoirs, Tc/Th?
A) 0.33 B) 0.0012 C) 0.0025 D) 0.67
If a wave from one slit of a Young's double-slit set-up arrives at a point on the screen one wavelength behind the wave from the other slit, what is observed at that point?
a. dark fringe b. bright fringe c. multi-colored fringe d. gray fringe, neither dark nor bright
Heat transfer that involves mass movement is
a. temperature. b. conduction. c. convection. d. radiation.