Doubling the momentum of
a. a particle doubles its relativistic total energy.
b. a particle quadruples its relativistic total energy.
c. a photon doubles its relativistic total energy.
d. a photon quadruples its relativistic total energy.
c
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Though Titan has a small mass , it is able to retain an atmosphere because it
a. is very cold. b. is very hot c. has an iron surface d. attracts gas from the solar wind.
Why can't Thomasin find any constellations she recognizes?
A: Dusty regions like those in the Whirlpool Galaxy are preventing the starlight escaping the Milky Way. B: Black holes in the spaces between galaxies trap enough light to render most stars invisible from long distances. C: Warping of space-time by galaxy masses bends the starlights' paths and distorts the constellations' shapes. D: From any position far outside the Solar System, the stars are seen at different angles and fall out of the constellations' traditional shapes. E: Not enough time has passed for the Milky Way stars' light to reach the Kiranye's galaxy.
What are the two fundamental laws that lie at the heart of quantum mechanics?
A) the uncertainty principle and the exclusion principle B) the absoluteness of the speed of light and the equivalence principle C) the law of conservation of energy and the electromagnetic force law D) the law of conservation of angular momentum and the law of conservation of energy
X-rays may be correctly regarded as
A) high frequency sound waves. B) high frequency radio waves. C) both of these D) none of these