In a pulsating variable star,which characteristic of the star changes dramatically with time?
A) mass
B) core temperature
C) luminosity
D) energy-generation process
E) rotation rate
Correct Answer:
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Q17: Which of the following statements about apparent
Q18: What are the standard units for apparent
Q19: What are the standard units for luminosity?
A)watts
B)joules
C)Newtons
D)kilograms
E)watts
Q20: If the distance between us and a
Q21: On a Hertzsprung-Russell diagram,where would we find
Q23: Why are Cepheid variables so important for
Q24: On a Hertzsprung-Russell diagram,where would we find
Q25: On the main sequence,stars obtain their energy
A)from
Q26: On a Hertzsprung-Russell diagram,where would we find
Q27: Which of the following is true about
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