The angular resolution of an 8-inch diameter telescope is ________ greater than that of a 2-inch diameter telescope
A) 2 times
B) 4 times
C) 8 times
D) 9 times
E) 16 times
B
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How do scientists estimate how old the solar system is?
A) They measure the speeds and distances of galaxies, and calculate the time it took for them to travel that distance. B) They make a guess: no one really knows how old the solar system is. C) They look up the answer in a book. D) They measure how fast the Sun is losing energy, and how much energy it has to lose. E) They measure the abundances of radioactive elements in meteorites, and use their half-lives to calculate the age.
We cannot see tidal forces or tidal heating; rather, we predict that they must occur based on the orbital characteristics of the moons. What observational evidence confirms that tidal heating is important on Io?
a. Io's surprisingly elliptical orbit b. active volcanoes on Io c. Io's unusual, egg-like shape d. the orbital resonance between Io, Europa, and Ganymede
Single-Slit Diffraction: Using monochromatic light of 410 nm wavelength, a single thin slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum. The same slit, when illuminated by a new monochromatic light source, produces a diffraction pattern with the second minimum at a 60.0° angle from the central maximum. What is the wavelength of this new light?
A. 276 nm B. 293 nm C. 309 nm D. 326 nm E. 342 nm
The similarity that Newton recognized between a falling apple and the moon was
A) the force on both is directed toward Earth's center. B) both have an acceleration that is directed toward the center of Earth. C) Both of the above. D) Actually there is no important similarity between these two. E) None of the above.