_____ says that the amount of energy flowing out of the top of a layer in the star must be equal to ...

_____ says that the amount of energy flowing out of the top of a layer in the star must be equal to the amount of energy coming in at the bottom, plus whatever energy is generated within the layer.

A) The law of energy equilibrium
B) The law of conservation of energy
C) Mass-energy equivalence
D) Newton's law of energy transfer

Question 2

Identify a true statement about main-sequence stars.

A) They balance their gravity by fusing hydrogen.
B) They generate energy by breaking uranium isotopes.
C) They do not increase in size as they consume their fuel.
D) They do not undergo any molecular change during their life spans.

Question 3

When the nuclear reactions begin making too much energy in a star, by virtue of the natural thermostat, the star:

A) would expand slightly.
B) would increase its central temperature.
C) would increase its density.
D) would reduce the mass by a factor of 0.5.

Question 4

Among the modes of energy transfer in stars, _____ is the least efficient of all.

A) conduction
B) convection
C) radiation
D) evaporation

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_____ says that the amount of energy flowing out of the top of a layer in the star must be equal to ...

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