In the atomic nucleus there are often numerous positively charged protons What

In the atomic nucleus there are often numerous

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11. In the atomic nucleus there are often numerous positively charged protons. What keeps the nucleus from flying apart? A) The electromagnetic force. B) Neutrinos. C) The nuclear strong force. D) The force of gravity. 12. Two rocket ships are traveling past the Earth at 90% of the speed of light, in opposite directions (i.e., they are approaching each other). One turns on a searchlight, which is seen by scientists aboard the other. What speed do the scientists measure for this light (c = speed of light in a vacuum)?
Page 4 13. The center of the disk of the visible Sun appears brighter than the edges because we see 14. Which of the following objects is NOT an endpoint of a star's evolutionary life? 15. In the process of helium shell fusion in low-mass stars near the end of their lives, the star moves upward and to the right as a red giant in the Hertzsprung-Russell diagram. In this process, the star is A) contracting, becoming hotter, and becoming much less luminous. B) expanding, cooling, and becoming more luminous. C) expanding, heating up, and becoming more luminous. D) contracting, cooling, and hence becoming less luminous. 16. The neutrino is 17. In which of the following parameters does a photon of blue light NOT differ from a photon of yellow light, in a vacuum? 18. Pulsars, emitting very regular radio and sometimes visible light pulses, are what type of object?
Page 5 19. What determines whether a particular region of an interstellar cloud can collapse and form a star? A) The amount of gravity pulling inward compared to gas pressure pushing outward. B) The gas density, the ratio of the mass of the cloud over its volume, since this determines how gravity will act upon the cloud material. C) Only the amount of mass in the cloud, since this determines the strength of gravity. D) Only the temperature, since higher temperatures act to prevent collapse

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