Why do the predicted consequences of the special theory of relativity seem so strange to most of us?
A) because they are self-contradictory, making it impossible to make any sense of them
B) because they are obvious only at speeds that we never experience in our daily lives
C) because they contradict the well-tested ideas of Newton's laws of motion
D) because they affect only subatomic particles and not big things like people
B
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What do Viking, Pathfinder, and the two Mars Rovers have in common?
A) They all found proof of life on Mars. B) They all could move over the surface of Mars to examine the rocks. C) They all were designed to investigate Mars' potential for life. D) They all are still transmitting data from Mars to Earth. E) They all proved Mars was too inhospitable for life to have every existed there.
The nebular theory predicts that
A) most stars should have planetary systems B) only solar-type stars should have planetary systems C) planetary systems are relatively rare D) the Sun is unique in having a planetary system
A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal. (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 0.00 eV B) 0.37 eV C) 0.47 eV D) 0.53 eV
When the energy state of an atom changes by ?E, the frequency of the photon emitted or absorbed is calculated by dividing ?E by ______________
Fill in the blank(s) with correct word