In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions must be met?
a. Sources are coherent.
b. Sources are monochromatic.
c. Both choices above are valid.
d. None of the choices above are valid.
c
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Molecular Rotation: A diatomic molecule has 18 × 10-5 eV of rotational energy in the L = 2 quantum state. What is its rotational energy in the L = 0 quantum state? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 9.0 × 10-5 eV B. 6.0 × 10-5 eV C. 3.0 × 10-5 eV D. 0 eV
All the following statements are true. Which one follows directly from Kepler's third law?
A) Venus is more massive than Mercury. B) Venus orbits the Sun at a slower average speed than Mercury. C) Venus is larger than Mercury. D) Venus has a thicker atmosphere than Mercury.
A 15-?F capacitor is charged to 40 V and then connected across an initially uncharged 25-?F capacitor. What is the final potential difference across the 25-?F capacitor?
a. 12 V b. 18 V c. 15 V d. 21 V e. 24 V
What is the near point of a farsighted person who can read a newspaper held 25 cm from his eyes when he wears 3.33 diopters glasses?
A) 1.5 m B) 0.50 m C) 1.9 m D) 0.75 m E) 0.60 m