Energy Levels: What is the shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 822 nm
B. 850 nm
C. 103 nm
D. 91.4 nm
E. 950 nm
Answer: C
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A dielectric is inserted between the plates of an isolated parallel-plate capacitor that carries a charge Q. What happens to the potential energy stored in the capacitor?
A) The potential energy of the capacitor decreases. B) The potential energy of the capacitor increases or decreases depending on the value of the dielectric constant of the capacitor. C) The potential energy of the capacitor remains the same. D) The potential energy of the capacitor increases. E) More information is needed to answer the question.
Rutherfordium-261 has a half-life of 1.08 min. How long will it take for a sample of rutherfordium to lose one-third of its nuclei?
A) 1.02 min B) 1.62 min C) 0.63 min D) 2.70 min E) 3.24 min
If the scattering angle of the light in Compton's scattering experiment is 90°, what is the change in the wavelength of the light?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 1.22 × 10-12 m B) 2.42 × 10-12 m C) 3.65 × 10-12 m D) 4.85 × 10-12 m
The San Andreas fault
A) stretches from the Gulf of California to Cape Mendocino, California, and separates the Pacific Plate from the North American Plate. B) accommodates all the motion between the Pacific Plate and the North American Plate. C) is presently inactive. D) all of the above