As predicted by general relativity, time runs slightly slower at the peak of Mount Everest than it does at sea level
Indicate whether the statement is true or false
FALSE
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____________________ is a description of the Ptolemaic model of the solar system
Fill in the blank(s) with correct word
We don't hear the squeaks of bats because their sound is
A) of ultra-high frequencies. B) of ultra-high loudness. C) both of these D) neither of these
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.
If an electron has the same de Broglie wavelength as the wavelength of a 390-nm photon in vacuum, what is the speed of the electron? (melectron = 9.11 × 10-31 kg, c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 1900 m/s B) 2100 m/s C) 1700m/s D) 1500 m/s E) 540 m/s