Thin Films: When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its wavelength
A. increases by a factor of 3/2.
B. is reduced to 2/3 its original value.
C. is unaffected.
Answer: B
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How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. B) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. C) The total amount of gas will be much less than it is today. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
Atomic Nucleus: The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A. 3.6 × 10-13 B. 7.1 × 10-5 C. 5.1 × 10-9 D. 2.6 × 10-17
Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on earth. d. all of the above
This photo shows a satellite dish on a house. In essence, the dish is
A) the primary mirror of a radio telescope. B) a decoding device that translate radio signals into video. C) a tiny interferometer. D) a receiver with high angular resolution that makes it capable of displaying high-definition television.