The temperature variations of the cosmic microwave background observed by the Planck telescope agree well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation
B) only the Big Bang, but not inflation
C) not the Big Bang, but inflation
D) neither the Big Bang nor inflation
A) both the Big Bang and inflation
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Stars in the upper right part of the Hertzsprung-Russell diagram are always ____ when compared to stars near the middle of the diagram
a. cooler b. brighter as seen from Earth c. larger d. smaller e. more massive
Lenz's Law: As shown in the figure, two parallel wires carry a current I in opposite directions, and this current is decreasing. A rectangular loop is centered between the wires. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
Geological evidence points to a few very deep "snowball" phases in Earth's history, in which the oceans would have been mostly frozen. How did Earth recover from a snowball phase?
A) The increased ice coverage on Earth's surface absorbed more sunlight than water and rocks, thus gradually heating Earth until the ice melted. B) Life vanished, leading to an increase in CO2, and increased global warming, eventually melting the ice. C) Volcanoes continued to inject CO2 into Earth's atmosphere, increasing the greenhouse effect to the point where ice melted. D) Plate tectonics gradually subducted all the ice below Earth's surface. E) As the Sun aged, it grew brighter and increased Earth's temperature, melting the ice.
Dispersing light from a hot, low-pressure gas gives a spectrum of the type known as (two words) ______________ ______________
Fill in the blank(s) with correct word