The longest living stars are those of
A) low mass.
B) high mass.
C) intermediate mass.
Answer: A
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Shell Radius: If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n, then
A. its radius and binding energy will double. B. its radius will quadruple and the binding energy will double. C. its radius will double and the binding energy will quadruple. D. its radius will quadruple and the binding energy will be reduced by a factor of four. E. its radius and binding energy will quadruple.
In one cycle of any heat engine
A. more heat flows from the engine than enters the engine. B. the internal energy of the engine does not change. C. the net heat flow is zero. D. the net work done is larger than the heat exhausted.
A spaceship moves over my driveway at a relativistic speed. I observe that my driveway is the same length as the ship. I then conclude that the rest length of my driveway is ________ the rest length of the spaceship.
A. greater than B. less than C. the same as
The average distance from Earth to the sun is 1 AU
Indicate whether the statement is true or false