A capacitor consists of two large parallel plates of area A separated by a very small distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and then disconnected from the battery
If the separation between the plates is now doubled, the potential difference between the plates will A) double.
B) quadruple.
C) be cut in half.
D) be cut in fourth.
E) not change.
A
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An electron is confined in a harmonic oscillator potential well. A photon is emitted when the electron undergoes a 3?1 quantum jump
What is the wavelength of the emission if the net force on the electron behaves as though it has a spring constant of 9.6 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 290 nm B) 150 nm C) 190 nm D) 580 nm
Quasar spectra often show many absorption lines that all appear to be as a result of the same electron transition (such as level 1 to level 2 in hydrogen) but that fall at different wavelengths in the spectrum. Why do we think this is the case?
A) We are seeing absorption lines from clouds of gas that lie between us and the quasar, and therefore each cloud has a different redshift. B) Quasars are rotating rapidly, and this rotation produces spectral lines with a wide variety of Doppler shifts. C) The lines fall at different wavelengths because they are produced by different chemical elements. D) No one knows; it remains perhaps the greatest mystery about quasars.
If the value of H is doubled, it would also double the age of the universe
Indicate whether the statement is true or false
A heat engine absorbs 2500 J of heat from a hot reservoir and expels 1000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2500 J of heat to the hot reservoir, requiring 1500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
A. 1.0 (no) B. 1.0 (yes) C. 1.5 (yes) D. 1.5 (no) E. 2.5 (no)