Light passes through three ideal polarizing sheets. Unpolarized light enters the first sheet and the resultant vertically polarized beam continues through the second sheet and third sheet
The second sheet has its transmission axis at 50° with respect to the first sheet, and the third sheet is at 70° with respect to the first sheet.
(a) What percent of the original intensity emerges from filter #1?
(b) What percent of the original intensity emerges from filter #2?
(c) What percent of the original intensity emerges from filter #3?
(a) 50% (b) 21% (c) 18%
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The binding energy per nucleon of a nucleus
A) increases steadily as we go to heavier elements. B) is approximately constant throughout the periodic table, except for very light nuclei. C) has a maximum near iron in the periodic table and decreases after that for heavier elements. D) decreases steadily as we go to heavier elements. E) has a minimum near iron in the periodic table and increases after that for heavier elements.
According to current theories, the universe appears to be made
A) of dark matter B) of dark energy C) mostly of ordinary matter in the form of stars and galaxies D) of an equal mixture of dark matter and dark energy
Kaitlin uses a bat to hit a thrown baseball. She knocks the ball back in the direction from which it came in a partially inelastic collision. The bat, which is heavier than the baseball, continues to move in the same direction after the hit as Kaitlin "follows through." Is the ball moving faster before or after it was hit?
a. The ball was moving faster before it was hit. b. The ball was moving faster after it was hit. c. The ball was moving at essentially the same speed before and after the hit. d. There is insufficient information to answer this problem.
The fundamental time unit representing a major change in life forms is the
A) eon subdivision. B) era subdivision. C) period subdivision. D) epoch subdivision.