A 6.0-?F capacitor is connected in series with a 5.0 M? resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?
A) 6.5 ?A
B) 2.4 ?A
C) 1.3 ?A
D) 4.7 ?A
E) 9.1 ?A
Answer: B
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Doubling the number of effective opaque layers in a planet’s atmosphere from n to 2n will make its average surface temperature increase by what factor?
A. 2 B. 21/4 C. 31/4 D. (2 + 1/n)1/4 E. [2 + 1/(n+1)]1/4 F. Some other factor (specify) T. The factor depends on the planet’s initial temperature.
If you made a plot of open clusters on a star map, they would be
A. concentrated along the Galaxy's disk. B. evenly scattered on the page. C. clustered away from the Galactic bulge. D. spherically arranged in a halo.
Matter Waves: A proton has a speed of 7.2 × 104 m/s. What is the energy of a photon that has the same wavelength as the de Broglie wavelength of this proton? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 230 keV B. 150 keV C. 300 keV D. 370 keV E. 440 keV
The atmospheric pressure at the surface of the terrestrial planets increases as their distance from the Sun increases.
Answer the following statement true (T) or false (F)