Which are compact objects?
a. black holes b. neutron stars
c. white dwarfs d. All of the other choices are correct.
d
You might also like to view...
If our eyes were sensitive only to X rays, the world would appear __________.
A. gray, black, and white like a medical X ray B. brighter than normal because X rays carry more energy than visible light photons C. dark because X-ray light does not reach Earth’s surface D. green, yellow, and orange, because those are the colors of X rays
Which of the outer planets has rings?
A. Neptune B. Uranus C. Saturn D. Jupiter E. All of the outer planets have a ring system.
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.
The L absorption edge corresponds to the excitation of an electron out of an atomic orbital with the principal quantum number of _________.
Fill in the blank(s) with the appropriate word(s).