Author Question: What is the force that keeps a main sequence star from blowing apart? A) magnetism B) ... (Read 42 times)

Haya94 · **on:** Jul 27, 2018

What is the force that keeps a main sequence star from blowing apart?

A) magnetism
B) gravitation
C) the strong force
D) radiation pressure
E) electron degeneration pressure

Question 2

Define absorption and emission lines.

What will be an ideal response?

coyin · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

B

Answer to Question 2

Absorption: When light from a continuous source, such as the dense photosphere of a star, is passed though a thin, cool gas, certain energies from the continuum are absorbed, depending on which elements are present, creating a pattern of dark lines which identify the elements and molecules present in the cool gas cloud. Emission: A hot, thin gas cools off by emitting photons, but only at discrete wavelengths determined by the electron transitions downward of the component atoms. These appear as a pattern of bright emission lines.