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Stellar Evolution Review. 12-1.Protostars are not seen in visible light telescopes because: a)they don’t emit any radiation b)they are surrounded by clouds.

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Presentation on theme: "Stellar Evolution Review. 12-1.Protostars are not seen in visible light telescopes because: a)they don’t emit any radiation b)they are surrounded by clouds."— Presentation transcript:

1 Stellar Evolution Review

2 12-1.Protostars are not seen in visible light telescopes because: a)they don’t emit any radiation b)they are surrounded by clouds of gas and dust c)they only emit infrared radiation d)they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared

3 12-1.Protostars are not seen in visible light telescopes because: a)they don’t emit any radiation b)they are surrounded by clouds of gas and dust c)they only emit infrared radiation d)they are all moving away from Earth so fast that their visible light is Doppler shifted into the infrared

4 12-2.A brown dwarf is best described as: a)a low mass object that doesn’t fuse in its core b)a low mass main sequence star c)a high mass main sequence star

5 12-2.A brown dwarf is best described as: a)a low mass object that doesn’t fuse in its core b)a low mass main sequence star c)a high mass main sequence star

6 12-3.Why are A-type main sequence stars hotter than G-type main sequence stars? a)A-type stars have cores of metal, whereas G-type stars do not b)A-type stars have more fusion on their surface than G-type stars c)A-type stars have more fusion in their cores than G-type stars d)A-type stars fuse in their cores and near their surfaces, while G-type stars only fuse in their cores.

7 12-3.Why are A-type main sequence stars hotter than G-type main sequence stars? a)A-type stars have cores of metal, whereas G-type stars do not b)A-type stars have more fusion on their surface than G-type stars c)A-type stars have more fusion in their cores than G-type stars d)A-type stars fuse in their cores and near their surfaces, while G-type stars only fuse in their cores.

8 12-4.Where on the H-R diagram are the majority of stars located? a)as white dwarves b)on the main sequence c)as giants d)as supergiants

9 12-4.Where on the H-R diagram are the majority of stars located? a)as white dwarves b)on the main sequence c)as giants d)as supergiants

10 12-5.Which type of star is forming iron in its core? a)supergiant b)giant c)main sequence d)white dwarf

11 12-5.Which type of star is forming iron in its core? a)supergiant b)giant c)main sequence d)white dwarf

12 12-6. The Orion nebula is a) a reflection nebula illuminated by newly formed stars. b) an emission nebula heated by newly formed stars. c) a supernova remnant. d) a dark nebula.

13 12-6. The Orion nebula is a) a reflection nebula illuminated by newly formed stars. b) an emission nebula heated by newly formed stars. c) a supernova remnant. d) a dark nebula.

14 12-7. What happens when a protostar joins the main sequence? a) Its surface area increases significantly. b) Its luminosity increases significantly. c) Nuclear fusion begins in its core. d) Nuclear fission begins in its core.

15 12-7. What happens when a protostar joins the main sequence? a) Its surface area increases significantly. b) Its luminosity increases significantly. c) Nuclear fusion begins in its core. d) Nuclear fission begins in its core.

16 12-8. An object is found that emits most of its electromagnetic radiation in the infrared. This object could be a a) protostar. b) G-type star. c) B-type star. d) cool gas cloud.

17 12-8. An object is found that emits most of its electromagnetic radiation in the infrared. This object could be a a) protostar. b) G-type star. c) B-type star. d) cool gas cloud.

18 12-9. We see an emission nebula via a) reflected blue light from a nearby star. b) blue light emitted by hot (excited) hydrogen atoms. c) red light emitted by hot (excited) hydrogen atoms. d) reflected red light from a nearby star.

19 12-9. We see an emission nebula via a) reflected blue light from a nearby star. b) blue light emitted by hot (excited) hydrogen atoms. c) red light emitted by hot (excited) hydrogen atoms. d) reflected red light from a nearby star.

20 12-10. Which of the following are thought to be mechanisms that cause a giant molecular cloud to collapse and form a protostar? a) The shockwave from a nearby supernova b) The shockwave from a newly formed high-mass star that is nearby c) The shockwave experienced by the cloud as it passes through a spiral arm d) All of the above

21 12-10. Which of the following are thought to be mechanisms that cause a giant molecular cloud to collapse and form a protostar? a) The shockwave from a nearby supernova b) The shockwave from a newly formed high-mass star that is nearby c) The shockwave experienced by the cloud as it passes through a spiral arm d) All of the above

22 12-12. Red giants burn helium via nuclear fusion in their core. The ash (end product) of this nuclear fusion is a) iron. b) hydrogen. c) lithium and carbon. d) carbon and oxygen.

23 12-12. Red giants burn helium via nuclear fusion in their core. The ash (end product) of this nuclear fusion is a) iron. b) hydrogen. c) lithium and carbon. d) carbon and oxygen.

24 12-13.Where is the Sun located on this H-R diagram? a)A b)B c)C d)D e)E

25 12-13.Where is the Sun located on this H-R diagram? a)A b)B c)C d)D e)E

26 12-14.Which stars on this H-R diagram are on the main sequence? a)Vega, Sirius A, & Mira b)Stars at letters A & B & Barnard’s Star c)Sirius A & Sirius B d)Rigel & Deneb e)Pollux & Barnard’s Star

27 12-14.Which stars on this H-R diagram are on the main sequence? a)Vega, Sirius A, & Mira b)Stars at letters A & B & Barnard’s Star c)Sirius A & Sirius B d)Rigel & Deneb e)Pollux & Barnard’s Star

28 13-1.A nova is believed to occur when which of the following pairs of stars are in a binary system? a)white dwarf, main sequence star b)white dwarf, neutron star c)neutron star, red giant d)a pair of supergiants

29 13-1.A nova is believed to occur when which of the following pairs of stars are in a binary system? a)white dwarf, main sequence star (when the main sequence star expands as it ages…) b)white dwarf, neutron star c)neutron star, red giant d)a pair of supergiants

30 13-2.What is the most dense element formed in the cores of any stars? a)helium b)lead c)iron d)carbon

31 13-2.What is the most dense element formed in the cores of any stars? a)helium b)lead c)iron d)carbon

32 13-3.Which type of star is not fusing anything in its core? a)main sequence b)giant c)supergiant d)neutron star

33 13-3.Which type of star is not fusing anything in its core? a)main sequence b)giant c)supergiant d)neutron star

34 13-4.A pulsar is best described as a: a)a rapidly rotating white dwarf b)a rapidly rotating neutron star c)an expanding and contracting white dwarf d)an expanding and contracting neutron star

35 13-4.A pulsar is best described as a: a)a rapidly rotating white dwarf b)a rapidly rotating neutron star c)an expanding and contracting white dwarf d)an expanding and contracting neutron star

36 13-5.White dwarves are composed primarily of: a)helium b)neutrons c)carbon and oxygen d)iron

37 13-5.White dwarves are composed primarily of: a)helium b)neutrons c)carbon and oxygen d)iron

38 13-6.The diameter of a white dwarf is closest to which of the following? a)about 1 A.U. b)about the diameter of the Sun c)about the diameter of the Earth d)about 10 kilometers

39 13-6.The diameter of a white dwarf is closest to which of the following? a)about 1 A.U. b)about the diameter of the Sun c)about the diameter of the Earth d)about 10 kilometers

40 13-7.The Sun will end its “life” as a(n): a)supernova. b)nova. c)planetary nebula.

41 13-7.The Sun will end its “life” as a(n): a)supernova. b)nova. c)planetary nebula.

42 13-9.Explosions on the surfaces of white dwarves in binary star systems are called: a)novas b)supernovas c)flares d)planetary nebulas

43 13-9.Explosions on the surfaces of white dwarves in binary star systems are called: a)novas b)supernovas c)flares d)planetary nebulas

44 13-10.Rotating neutron stars with off-axis magnetic fields are called: a)white dwarves b)pulsars c)quasars d)nebulae

45 13-10.Rotating neutron stars with off-axis magnetic fields are called: a)white dwarves b)pulsars c)quasars d)nebulae

46 13-11.A 15 M  main sequence star will eventually shed mass as a: a)supernova. b)nova. c)planetary nebula. d)Cepheid

47 13-11.A 15 M  main sequence star will eventually shed mass as a: a)supernova. b)nova. c)planetary nebula. d)Cepheid

48 13-12.A one solar mass star will a) go through a red giant phase and end its life as a white dwarf. b) not go through a red giant phase and end its life as a white dwarf. c) go through a red giant phase and end its life as a black hole. d) not go through a red giant phase and end its life as a black hole.

49 13-12.A one solar mass star will a) go through a red giant phase and end its life as a white dwarf. b) not go through a red giant phase and end its life as a white dwarf. c) go through a red giant phase and end its life as a black hole. d) not go through a red giant phase and end its life as a black hole.

50 13-13. White dwarfs usually have surface temperatures well above 10,000 K, yet they have extremely low luminosity. Why is this? a) They are very far away. b) They have a very large surface area. c) They emit most of their radiation in the far infrared. d) They have a very small surface area.

51 13-13. White dwarfs usually have surface temperatures well above 10,000 K, yet they have extremely low luminosity. Why is this? a) They are very far away. b) They have a very large surface area. c) They emit most of their radiation in the far infrared. d) They have a very small surface area.

52 13-15. White dwarfs are not referred to as stars because a) they do not produce energy by nuclear fusion. b) they are not luminous enough to qualify as a star. c) we do not know how they produce their energy. d) they do not contain any hydrogen.

53 13-15. White dwarfs are not referred to as stars because a) they do not produce energy by nuclear fusion. b) they are not luminous enough to qualify as a star. c) we do not know how they produce their energy. d) they do not contain any hydrogen.

54 13-16. Elements heavier than iron are produced by nuclear reactions a) in a white dwarf. b) during a supernova explosion of a massive star. c) in the shells around the core of a high mass star. d) in the core of a massive star just before it explodes as a supernova.

55 13-16. Elements heavier than iron are produced by nuclear reactions a) in a white dwarf. b) during a supernova explosion of a massive star. c) in the shells around the core of a high mass star. d) in the core of a massive star just before it explodes as a supernova.

56 13-17. A neutron star is a) left behind after a Type I supernova explosion. b) created if a star stops burning hydrogen and contracts. c) created if a star stops burning helium and contracts. d) left behind after a Type II supernova explosion.

57 13-17. A neutron star is a) left behind after a Type I supernova explosion. b) created if a star stops burning hydrogen and contracts. c) created if a star stops burning helium and contracts. d) left behind after a Type II supernova explosion.

58 13-18. The rotation rate of neutron stars a) is constant. b) is slowing down in all cases. c) is slowing down for isolated pulsars, but can be speeding up for pulsars in binary systems if mass transfer occurs. d) is speeding up for all pulsars.

59 13-18. The rotation rate of neutron stars a) is constant. b) is slowing down in all cases. c) is slowing down for isolated pulsars, but can be speeding up for pulsars in binary systems if mass transfer occurs. d) is speeding up for all pulsars.

60 13-19.Helium fusion takes place in the core of a red giant star. These fusion reactions produce a)iron. b)hydrogen. c)lithium and carbon. d)carbon and oxygen. e)beryllium and carbon.

61 13-19.Helium fusion takes place in the core of a red giant star. These fusion reactions produce a)iron. b)hydrogen. c)lithium and carbon. d)carbon and oxygen. e)beryllium and carbon.


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