Which of the following statements about an open cluster is true?
A) All stars in the cluster are approximately the same color.
B) All stars in the cluster are approximately the same age.
C) All stars in the cluster have approximately the same mass.
D) All stars in the cluster will evolve similarly.
E) There is an approximately equal number of all types of stars in the cluster.
B
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Shell Radius: Which of the following statements are true for the Bohr model of the atom? (There could be more than one correct choice.)
A. The spacing between all the electron shells is the same. B. The energy difference between all the electron shells is the same. C. As we look at higher and higher electron shells, they get closer and closer together, but the difference in energy between them gets greater and greater. D. As we look at higher and higher electron shells, they get farther and farther apart, but the difference in energy between them gets smaller and smaller. E. There is no general pattern in the spacing of the shells or their energy differences.
The Greek astronomer who assigned the stars to six magnitudes was named ______________
Fill in the blank(s) with correct word
Process of Science: Because we do not see stellar parallaxes with our eyes, we conclude that the Earth is at the center of the Solar System
Indicate whether the statement is true or false
A metal with a work function of 5 eV and a metal with a work function of 3 eV are brought together in electrical contact. They produce a contact voltage equal to _________volts.
Fill in the blank(s) with the appropriate word(s).