During each cycle, a heat engine takes in 4.0 J of heat, does 1.0 J of work, and expels 3.0 J of heat. What is its efficiency?
What will be an ideal response?
25%
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Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 108 m/s)
A) 3.3 × 1014 Hz B) 5.0 × 1014 Hz C) 3.3 × 105 Hz D) 5.0 × 105 Hz
If sunlight were green instead of white, the most comfortable color to wear on a cold day would be
A) magenta. B) yellow. C) green. D) blue. E) violet.
Molecular Bonds: Van der Waals bonding is due to
A. the sharing of electrons between atoms. B. the transfer of electrons between atoms. C. unequal charge distribution around neutral molecules. D. atoms bonding to hydrogen molecules.
A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum?
A) at either A or B B) midway between A and B C) one-third of the way between A and B D) one-fourth of the way between A and B E) none of the above