Light behaves like
a. a wave at times, and a particle at other times.
b. a wave.
c. a particle.
d. both a wave and a particle, because of its dual nature.
a
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The process whereby heat flows in the absence of any medium is referred to as
A) conduction. B) convection. C) radiation. D) inversion. E) evaporation.
Because of their short lifetimes, very few muons that are produced in the upper atmosphere at high speeds should be observed at the surface of the earth. Yet we detect large numbers of muons at ground level because of the Pauli exclusion principle
Indicate whether the statement is true or false
As Curtiss thought, our Milky Way is now known to be quite similar to the nearby Andromeda Galaxy, M-31
Indicate whether the statement is true or false
What evidence suggests that small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation. B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older. C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past. D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during an age of starburst activity. E) We do not have any evidence that galaxies in our Local Group were once starburst galaxies.