A star lifetime can theoretically be computed if we know this physical property

Question

A star lifetime can theoretically be computed if we know this physical property of a star's a. Mass b. Size c. Surface temperature d. Luminosity In the H-R diagram, 90 percent of all stars are a. In the giant region. b. In the supergiant region. c. Among the B stars. d On the main sequence. This type of star does not mark the end of a star lifetime, but the beginning a. Nova. b. Supernova. c. T Tauri. d. This is not true. All of the above objects mark the end of a star life. What physical property of a star does the spectral type (or "spectral class") measure? a. Density. b. Luminosity. c. Surface temperature. d Mass. Star "Mimi" is a main sequence star of spectral type B3 and star "Fifi" is a white dwarf of spectral type 83. Which statement below is correct? a. Star "Mimi" appears brighter than star "Fifi". b. Star "Fifi" appears brighter than star "Mimi". c. Star "Mimi" is hotter than star "Fifi". d. Star "Fifi" is hotter than star "Mimi". Star "Joelle" is a supergiant star of spectral type K9 and star "Ahlam" is a main sequence of spectral type K9. Which statement below is correct? a. Star "Joelle" is hotter than star "Ahlam". b. Star "Ahlam" is hotter than star "Joele". c. Star "Joelle" is larger than star "Ahlam". d. Star "Joelle" is smaller than star "Ahlam". When a very high mass star has evolved to an iron core, the gravitational collapse of the core causes the star to then explode, resulting in a: a. Type I supernova b. Type II supernova c. X-ray burster d Gamma-ray burster During its lifetime, the Sun will pass through these different orderly phases a Main sequence, Red Giant, Planetary Nebula, White Dwarf. b Red Giant, Main Sequence, Planetary Nebula, White Dwarf. c White Dwarf, Planetary Nebula, Main Sequence, Red Giant. d. Main Sequence, Planetary nebula, White Dwarf, Red Giant. The Hertzsprung-Russell Diagram plots _____ against the spectral type or temperature. a. Distance. b. Luminosity or absolute magnitude. c Brightness or apparent magnitude. d Size or density.

Explanation / Answer

61- a) mass

62- d) main sequence.

63- d) not true ( nebula is the ans)

64- a) density

65- a) mimi appers brighter than fifi.

66- c) star joelie is larger than a star ahlm

67-b) type 2 supernova.

68- c) white dwarf, planetry nebula,main sequence ,red giant

69- b) luminosity or absolute magnitude

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