Which of the following statements about various stages of core nuclear fusion (hydrogen, helium, carbon, and so on) in a high-mass star is not true?
A) Each successive stage lasts for approximately the same amount of time.
B) As each stage ends, the core shrinks and heats further.
C) Each successive stage creates an element with a higher atomic number and atomic mass number.
D) As each stage ends, the reactions that occurred in previous stages continue in shells around the core.
A) Each successive stage lasts for approximately the same amount of time.
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A 3rd magnitude star is 3 times brighter than a 1st magnitude star
a. True b. False Indicate whether the statement is true or false
The presence of a magnetic field is a good indication that
A) the Earth's interior is similar to Mercury's, as both have fields. B) a huge iron meteorite lies somewhere high up in the mantle, not in the core. C) the Earth has a liquid metal outer core, spinning rapidly as it rotates. D) the Earth's interior has had time to solidify, with a rigid bar magnet created. E) the Earth's interior must be completely molten to the center.
Our model for explaining the electrical interaction between charged objects
A. makes sense only at very high speeds. B. depends very strongly on the mass of the two objects. C. depends on the existence of three kinds of charge. D. postulates that an electric field surrounds each charged object.
A simple magnifier of refractive power 15.0 D is used to observe a beetle on a student’s desk. If the image of the beetle is twice as large as the beetle itself, where is the image formed relative to the lens?
A. 4.5 cm B. 8.3 cm C. 5.0 cm D. 3.6 cm E. 5.6 cm