Interstellar dust consists mostly of ________
A) the same tiny particles found in household dust
B) tiny grains of water ice
C) ozone "smog"
D) microscopic particles of carbon and silicon
E) hydrogen and helium atoms
D
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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
When a 24.0-W resistor is connected across a 12.0-V battery, a current of 410 mA flows. What is the internal resistance of the battery?
a. 29.3 W c. 5.3 W b. 0.9 W d. 0.02 W
If the tilt of Earth's rotation axis was increased from 23.5° to 40°, what would we expect to change?
A) Seasons on Earth would become more extreme (hotter summers, colder winters). B) Seasons on Earth would become less extreme (cooler summers, warmer winters). C) The Earth would not experience seasons anymore. D) Nothing would change about weather on Earth.
Sedimentary layer A is found above sedimentary layer B, and the two are separated by a horizontal layer of ash, C. Therefore, the order from oldest to youngest is
a. B, C, A. b. C, B, A. c. A, C, B. d. none of these.