The hydrogen and helium in our solar system were created from subatomic particles about ____________ years ago
a. 14 billion
b. 10.5 billion
c. 7.0 billion
d. 4.5 billion
a
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A sound intensity of 70 dB is observed at a distance d from the source of sound. What sound intensity would be observed at a distance 2d from the source?
a. 68 dB b. 67 dB c. 64 dB d. 62 dB
The colors dispersed by a prism are due to different light
A) speeds inside the prism. B) directions inside the prism. C) energies inside the prism. D) none of the above
An electron and a positron, which are two massive particles, can annihilate when they come together to produce two photons, which have no mass. This pair annihilation is an example of
a. time dilation b. length contraction c. the equivalence of mass and energy d. the principle of relativity e. none of the above
According to the nebular theory, what are asteroids and comets?
A) leftover planetesimals that never accreted into planets B) chunks of rock or ice that condensed long after the planets had formed C) the shattered remains of collisions between moons D) the shattered remains of collisions between planets E) chunks of rock or ice that have been expelled from the planets by volcanoes