Dark lines that appear in the spectra observed in stellar atmospheres indicate the fact that
A. atoms that would produce light of the darkened frequency bands aren’t present in the atmosphere.
B. atoms are present in the atmosphere that have electrons that are absorbing photons of those frequencies.
C. atoms are present in the atmosphere that have electrons that are emitting photons of those frequencies
D. atoms that would produce light of the darkened frequency bands are forbidden from doing so because of quantum effects.
B. atoms are present in the atmosphere that have electrons that are absorbing photons of those frequencies.
You might also like to view...
Discuss the observational differences between spiral, elliptical, and irregular galaxies
What will be an ideal response?
What is the importance of the carbon dioxide (CO2) cycle?
A) It regulates the carbon dioxide concentration of our atmosphere, keeping temperatures moderate. B) It makes the growth of continents possible. C) It allows for an ultraviolet-absorbing stratosphere. D) It will prevent us from suffering any consequences from global warming.
Farsightedness can be corrected with a converging lens
Indicate whether the statement is true or false
Which of the following hypothetical observations would contradict our theories about the formation and evolution of white dwarfs?
A) discovery of a white dwarf with a surface temperature of 6000 K B) discovery of a white dwarf with a 1.5 Msun mass main-sequence companion C) discovery of a white dwarf with a mass 1.5 times that of the Sun (1.5 Msun) D) discovery of a white dwarf at the center of a planetary nebula