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96) The heaviest nuclei of all formed A) in the horizontal

Question : 96) The heaviest nuclei of all formed A) in the horizontal : 1828921

96) The heaviest nuclei of all are formed

A) in the horizontal branch.

B) in dense white dwarfs.

C) during nova explosions.

D) in the ejection of matter in the planetary nebula.

E) in the core collapse that sets the stage for Type II supernovae.

97) The Chandrasekhar limit is

A) the upper-mass limit for a white dwarf.

B) the temperature at which hydrogen fusion starts.

C) the temperature at which helium fusion starts.

D) the point at which a planetary nebula forms.

E) the lower-mass limit for a Type II supernova.

98) Where was supernova 1987A located?

A) in the Orion Nebula, M42

B) in Sagittarius, near the Galactic Nucleus

C) in our companion galaxy, the Large Magellanic Cloud

D) in M13, one of the closest of the evolved globular clusters

E) near the core of M31, the Andromeda Galaxy

99) Which of these events is not possible?

A) low-mass stars swelling up to produce planetary nebulae

B) red giants exploding as Type II supernovae

C) close binary stars producing recurrent novae explosions

D) white dwarfs and companion stars producing recurrent Type I supernova events

E) a white dwarf being found in the center of a planetary nebula

100) Which of these does not depend on a close binary system to occur?

A) a nova

B) a Type I supernova

C) a Type II supernova

D) All of these need mass transfer to occur.

E) None of these depend on mass transfer.

101) What can you conclude about a Type I supernova?

A) It was originally a low-mass star.

B) It was originally a high-mass star.

C) Its spectrum will show large amounts of hydrogen.

D) Its core was mostly iron.

E) The star never reached the Chandrasekhar limit.

102) A recurrent nova could eventually build up to a

A) planetary nebula.

B) Type I supernova.

C) Type II supernova.

D) hypernova.

E) quasar.

103) The brightest stars in a young open cluster will be

A) Cepheid variables.

B) massive blue main-sequence stars.

C) red giants.

D) yellow main-sequence stars like the Sun.

E) T-Tauri variables.

104) What is the typical age for a globular cluster associated with our Milky Way?

A) a few million years

B) 200 million years

C) a billion years

D) 10-12 billion years

E) 45 billion years

105) Which is used observationally to determine the age of a star cluster?

A) the total number of main-sequence stars

B) the ratio of giants to supergiants

C) the luminosity of the main-sequence turn-off point

D) the number of white dwarfs

E) the amount of dust that lies around the cluster

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