Which of the following statements about spectral types of stars is always true?

A) A star with spectral type G has a lower interior temperature than a star with spectral type B.
B) A star with spectral type G has a lower mass than a star with spectral type B.
C) A star with spectral type G has a cooler surface temperature than a star with spectral type B.
D) A star with spectral type G has a smaller radius than a star with spectral type B.
E) All of the above are true.


C) A star with spectral type G has a cooler surface temperature than a star with spectral type B.

Physics & Space Science

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OUHMWPE fibers are high in strength because the LCMs are oriented ______________to the fiber axis.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Molecular Speeds: The absolute temperature of a gas is T. In order to double the rms speed of its molecules, what should be the new absolute temperature?

A. 4T 
B. 2T 
C. T
D. 8T
E. 16T 

Physics & Space Science

A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 400 K and 200 K will have what maximum efficiency?

a. 50% b. 50% c. 40% d. 45% e. 25%

Physics & Space Science

What are the mass number A and the charge (in units of e) for each of the following particles or rays? (a) beta-plus (b) beta-minus (c) gamma ray

What will be an ideal response?

Physics & Space Science