42 the suns spectrum peaks in the green region of the

This preview shows page 9 - 12 out of 12 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
An Introduction to Physical Science
The document you are viewing contains questions related to this textbook.
Chapter 18 / Exercise 14
An Introduction to Physical Science
Shipman/Wilson
Expert Verified
____ 42. The Sun's spectrum peaks in the green region of the spectrum (i.e., green is the most intense color in its spectrum). The spectrum of Rigel peaks near the short wavelength end of the visible spectrum. Compared with the Sun, Rigel isA) cooler and redder.B) hotter and redder.C) cooler and bluer.D) hotter and bluer.
____ 43. The spectral class of the Sun is G2 and the star Enif is K2. From this information, we know that Enif is
Page 9
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
An Introduction to Physical Science
The document you are viewing contains questions related to this textbook.
Chapter 18 / Exercise 14
An Introduction to Physical Science
Shipman/Wilson
Expert Verified
____ 44. Two stars are found to have the same spectral type, K7. However, one star is 16 times as intrinsically luminous as the other. From this information, what can you determine about their radii?
____ 45. Measurements indicate that a certain star has a very high intrinsic brightness (100,000 times as bright as our Sun), yet is relatively cool (3500 K). How can this be?
____ 46. Brown dwarfs areA) stars made almost entirely out of brown dust.B) objects with masses too small to sustain thermonuclear reactions and be considered stars.C) old stars, contracting after using up all of their available hydrogen fuel.D) stars that lie between types O and A.
____ 47. The two stars in a binary system have masses of 1 solar mass and 4 solar masses. The semi-major axis of their relative orbit is 5 AU. What is the period of their orbit around each other?
____ 48. Two stars in a binary system orbit each other such that star A is 2 AU from the center of mass of the system and star B is 5 AU from the center of mass of the system. If the mass of star A is 10 solar masses, then what is the mass of star B?
Page 10
____ 49. We observe a periodic dip in the brightness of a star when we monitor it for a while. A spectrum of this same star shows spectral lines that shift back and forth with the same periodicity. What does this mean?
____ 50. Binary stars are useful becauseA) by observing the size and period of their orbits, their masses can be determined.B) they are the most luminous of stars, and therefore, can be seen to large distances.C) they confirm the Doppler effect theory.D) we can easily measure their distances from us.
Page 11
Answer Key - Exam21. C2. C3. D4. B5. D6. B7. C8. A9. A10. C11. A12. B13. D14. A15. B16. B17. B18. B19. B20. B21. A22. C23. A24. A25. D26. B27. D28. D29. D30. D31. C32. D33. D34. A35. C36. C37. C38. C39. B40. D41. A42. D43. B44. C45. D46. B47. C48. B49. A50. A
Page 12

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture