Which of the following statements regarding stars is false ? Stars form from den
ID: 1793829 • Letter: W
Question
Which of the following statements regarding stars is false?
Stars form from denser fragments of large clouds of gas & dust that collapse gravitationally.
Brown dwarfs have insufficient mass to develop into stars.
Pre-main-sequence stars, which have not yet started nuclear fusion, do not emit radiation.
Once nuclear reactions begin in core of a collapsing star, it can settle on the main sequence.
Photons (gamma rays) emitted in fusion reactions in the centers of stars can take a half a million years, or more, to escape into space.
a.Stars form from denser fragments of large clouds of gas & dust that collapse gravitationally.
b.Brown dwarfs have insufficient mass to develop into stars.
c.Pre-main-sequence stars, which have not yet started nuclear fusion, do not emit radiation.
d.Once nuclear reactions begin in core of a collapsing star, it can settle on the main sequence.
e.Photons (gamma rays) emitted in fusion reactions in the centers of stars can take a half a million years, or more, to escape into space.
Explanation / Answer
A)True,Stars form from denser fragments of large clouds of gas.
B)true
Brown dwarfs are less massive than stars, but more massive than giant planets such as Jupiter. They have insufficient mass to produce the temperatures and pressures at their cores necessary to trigger the thermonuclear reactions that power “normal” stars.
C)False, pre-main-sequence star generates energy through gravitational contraction.The outer regions of a massive star transport energy by radiation, with little or no convection.
D)true, These reactions produce tremendous amounts of energy, halting the collapse process and allowing the star to settle onto what is called the main sequence
E)true ,where nuclear reactions occur and gamma rays produced. radiative zone. photons are repeatedly reabsorbed and emitted and the energy of an individual photon can take on average 170,000 years to pass through.
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