The driving force of our planet's hydrologic cycle comes from
A) the balance between precipitation and evaporation.
B) precipitation of water over the oceans.
C) solar energy.
D) wind.
Answer: C
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Star A has a radius of 200 000 km and a surface temperature of 6 000 K. Star B has a radius of 400 000 km and a surface temperature of 3 000 K. The emissivity of both stars is the same. What is the ratio of the rate of energy radiated by Star A to that of Star B?
The spacing of the atoms in the H2 molecule is 7.4 x 10-11 m. What is the energy of the L = 1 rotational level?
A) 9.0 x 10-2 eV B) 7.0 x 10-2 eV C) 4.5 x 10-2 eV D) 3.0 x 10-2 eV E) 1.5 x 10-2 eV
Two wave pulses pass each other on a string. The one traveling toward the right has a positive amplitude, while the one traveling toward the left has an equal amplitude in the negative direction
At the point that they occupy the same region of space at the same time A) constructive interference occurs. B) destructive interference occurs. C) a standing wave is produced. D) a traveling wave is produced. E) a wave pulse is produced.
It was the distribution of ________ that showed Harlow Shapley we were nowhere near the center of the Milky Way early in the 20th century
A) planetary nebulae B) emission nebulae C) open clusters D) globular clusters E) supernova remnants