Question

In: Physics

Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is...

Indicate whether the following statements are true or false. (Select T-True, F-False. If the first is T and the rest F, enter TFFFFF).

A) A white dwarf is the remnant of the star's core visible after the outer layers have been ejected.

B) A planetary nebula is made of hot gas that shows emission line spectra.

C) A planetary nebula forms when a star violently explodes.

D) White dwarfs are small dense objects about the size of the Earth.

E) White dwarfs are composed mostly of hydrogen.

F) A planetary nebula is the remnant of the outer envelope of a star

Solutions

Expert Solution

A) True

White swarf is the remanant of the core of the star after it stops supporting gravitational force with the radiation pressure due to the burning matter present in the star.Thus outer layers being ejected.

B) True

Planetary Nebula is an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives and therefore shows emission lines.

C) False

When a star violently explodes it forms a compact object but planetary nebula is formed at later stages of red giant stars.

D) True

White dwarfs are around the size of 10000 kilometers which is compared to that of earth's. Also these are dense objects having mass of sun like stars.

E) False

No white dwarfs consists of Carbon and oxygen in the core which is mostly contributing to the mass of white dwarfs. However Helium and Hydrogen is also present but only near the surface of it.Hydrogen content is much lesser than carbon and oxygen content content.

F) True

Answer: TTFTFT

genius_generous answered 2 years ago
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