A stage 4 object can be plotted on the H-R diagram. At this stage, the star will appear:
A) in the middle left of the diagram.
B) in the middle right of the diagram.
C) just on the bottom right of the main sequence.
D) down and to the left of where it will be when it is a main sequence star.
E) in the middle of the main sequence.
B
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Outgassing refers to the formation of an atmosphere by the attraction of gases from the surrounding nebula
a. True b. False Indicate whether the statement is true or false
The index of refraction of diamond is 2.42. This means that a given frequency of light travels
A) 2.42 times faster in air than it does in diamond. B) 2.42 times faster in diamond than it does in air. C) 2.42 times faster in vacuum than it does in diamond. D) 2.42 times faster in diamond than it does in vacuum. E) 2.42 times faster in vacuum than it does in air.
An astronaut on another planet drops a 1-kg rock from rest and finds that it falls a vertical distance of 2.5 meters in one second. On this planet, the rock has a weight of
A) 1 N. B) 2 N. C) 3 N. D) 4 N. E) 5 N.
A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is
A) 30 hertz and it travels at 60 m/s. B) 60 hertz and it travels at 30 m/s. C) 1800 hertz and it travels at 2 m/s. D) none of the above