Diffraction takes place:
a. on highly reflective surfaces.
b. on rough surfaces.
c. around the edges of barriers.
d. for waves moving through empty space.
e. in the center of shadows.
c
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It is possible for a medium-mass star to collapse and form a white dwarf, but no planetary nebula
a. True b. False Indicate whether the statement is true or false
The more ordinary (baryonic) matter there is in the universe, the lower the ratio of deuterium to hydrogen. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
A) the same density of ordinary matter as Sally. B) a lower density of ordinary matter than Sally. C) a higher density of ordinary matter than Sally.
Ancient philosophers and astronomers accepted without question-as first principles-that:
A) heavenly objects must move in circular paths at varying speeds.
B) the planets are made of rock and gas, much like Earth.
C) the Earth is motionless at the center of the Universe.
D) there are many galaxies in the Universe.
The energy radiated by the sun has as its primary origin energy produced by ________ reactions.
What will be an ideal response?