Because of absorption, a Polaroid will actually transmit about 40% of incident nonpolarized light. Two Polaroids with their axes aligned will transmit
A) 0%.
B) 40%.
C) 100%.
D) between 0% and 40%.
E) between 40% and 100%.
Answer: D
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Compared to the particles making up most of Saturn's rings, the albedo of Uranus's and Neptune's particles is less
a. True b. False Indicate whether the statement is true or false
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.
What happens in the double-slit experiment with electrons if we place an electron detector just behind one of the slits?
A) This tells us which slit each electron comes through, and has no effect on the pattern formed on the screen. B) This tells us which slit each electron comes through, but it also changes the pattern formed on the screen. C) This provides no information concerning which slit each electron comes through, but it does change the pattern formed on the screen. D) This provides no information concerning which slit each electron comes through, and has no effect on the pattern formed on the screen. E) We can then predict the precise point at which the electron will strike the screen.
Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler b. brighter as seen from Earth c. larger d. smaller e. more massive