Kepler discovered that planets do not move at uniform speeds along their elliptical orbits
a. True
b. False
Indicate whether the statement is true or false
True
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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 frequency
A. increases by a factor of 3/2. B. is reduced to 2/3 its original value. C. is unaffected.
Scientific thinking developed only in the past few decades
Indicate whether the statement is true or false
Two-Source Interference of Sound: Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m. A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s.
A. 278 Hz B. 422 Hz C. 452 Hz D. 562 Hz E. 694 Hz
A BL Lac object is the same as a
a. Type 1 Seyfert. b. Type 2 Seyfert. c. double-lobed radio galaxy. d. blazar. e. quasar.