Dalton developed ________ as one of the foundations for the atomic theory.
A. the Principle of Equivalence
B. the Law of Definite Proportions
C. Mach's Principle
D. the law of supply and demand
E. the index of refraction
Answer: B
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What conclusion can be drawn from the fact that some planets and satellites with solid surfaces have impact craters?
A. The Sun went through several explosions, ejecting material that scarred the planets and satellites. B. The young planets had softer surfaces. C. Collisions between Solar System bodies and planetesimals were common at one time. D. Volcanoes were very active in the early stages of planet formation.
The rainy monsoonal climate of the Tibetan highlands results from
A) strong off-shore winds in the summer. B) a strong temperature contrast and pressure gradient from warm air over the highlands and cool air over the oceans. C) a strong temperature contrast and pressure gradient from cool air over the highlands and warm air over the oceans. D) none of these
Photon Energy: The human eye can just detect green light of wavelength 500 nm if it arrives at the retina at the rate of 2 × 10-18 W. How many photons arrive each second? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave
A) decreases. B) increases. C) is not affected.